diff --git a/client/src/main/java/client/MyModule.java b/client/src/main/java/client/MyModule.java
index e40e613..3ebcfe0 100644
--- a/client/src/main/java/client/MyModule.java
+++ b/client/src/main/java/client/MyModule.java
@@ -21,8 +21,8 @@ import client.scenes.nutrition.NutritionDetailsCtrl;
 import client.scenes.nutrition.NutritionViewCtrl;
 import client.scenes.recipe.IngredientListCtrl;
 import client.scenes.recipe.RecipeStepListCtrl;
-import client.service.NonFunctionalShoppingListService;
 import client.service.ShoppingListService;
+import client.service.ShoppingListServiceImpl;
 import client.service.ShoppingListViewModel;
 import client.utils.ConfigService;
 import client.utils.LocaleManager;
@@ -61,7 +61,7 @@ public class MyModule implements Module {
                 new WebSocketDataService<>()
         );
         binder.bind(ShoppingListViewModel.class).toInstance(new ShoppingListViewModel());
-        binder.bind(ShoppingListService.class).to(NonFunctionalShoppingListService.class);
+        binder.bind(ShoppingListService.class).to(ShoppingListServiceImpl.class);
         binder.bind(new TypeLiteral<WebSocketDataService<Long, Ingredient>>() {}).toInstance(
                 new WebSocketDataService<>()
         );
diff --git a/client/src/main/java/client/service/NonFunctionalShoppingListService.java b/client/src/main/java/client/service/NonFunctionalShoppingListService.java
index 82dad5c..595f6a3 100644
--- a/client/src/main/java/client/service/NonFunctionalShoppingListService.java
+++ b/client/src/main/java/client/service/NonFunctionalShoppingListService.java
@@ -3,12 +3,10 @@ package client.service;
 import com.google.inject.Inject;
 import commons.FormalIngredient;
 import commons.Recipe;
-import commons.RecipeIngredient;
-import javafx.util.Pair;
+import commons.Unit;
 import org.apache.commons.lang3.NotImplementedException;
 
 import java.util.List;
-import java.util.Optional;
 
 public class NonFunctionalShoppingListService extends ShoppingListService {
     @Inject
@@ -32,7 +30,7 @@ public class NonFunctionalShoppingListService extends ShoppingListService {
     }
 
     @Override
-    public void putArbitraryItem(String name) {
+    public void putArbitraryItem(Double amount, String name, Unit unit) {
         throw new NotImplementedException();
     }
 
@@ -52,7 +50,7 @@ public class NonFunctionalShoppingListService extends ShoppingListService {
     }
 
     @Override
-    public List<Pair<FormalIngredient, Optional<String>>> getItems() {
+    public List<ShopListItem> getItems() {
         throw new NotImplementedException();
     }
 
diff --git a/client/src/main/java/client/service/ShopListItem.java b/client/src/main/java/client/service/ShopListItem.java
new file mode 100644
index 0000000..f35b8d0
--- /dev/null
+++ b/client/src/main/java/client/service/ShopListItem.java
@@ -0,0 +1,32 @@
+package client.service;
+
+import commons.FormalIngredient;
+
+public class ShopListItem {
+    private FormalIngredient ingredient;
+    private String refRecipeName;
+    public ShopListItem(FormalIngredient ingredient, String refRecipeName) {
+        this.ingredient = ingredient;
+        this.refRecipeName = refRecipeName;
+    }
+    public ShopListItem(FormalIngredient ingredient) {
+        this.ingredient = ingredient;
+        this.refRecipeName = null;
+    }
+
+    public FormalIngredient getIngredient() {
+        return ingredient;
+    }
+
+    public String getRefRecipeName() {
+        return refRecipeName;
+    }
+
+    public void setRefRecipeName(String refRecipeName) {
+        this.refRecipeName = refRecipeName;
+    }
+
+    public void setIngredient(FormalIngredient ingredient) {
+        this.ingredient = ingredient;
+    }
+}
diff --git a/client/src/main/java/client/service/ShoppingListService.java b/client/src/main/java/client/service/ShoppingListService.java
index c212750..8f32152 100644
--- a/client/src/main/java/client/service/ShoppingListService.java
+++ b/client/src/main/java/client/service/ShoppingListService.java
@@ -3,28 +3,31 @@ package client.service;
 import com.google.inject.Inject;
 import commons.FormalIngredient;
 import commons.Recipe;
-import commons.RecipeIngredient;
-import javafx.util.Pair;
+import commons.Unit;
 
 import java.util.List;
-import java.util.Optional;
 
 public abstract class ShoppingListService {
-    private ShoppingListViewModel viewModel;
+    private final ShoppingListViewModel viewModel;
     @Inject
     public ShoppingListService(ShoppingListViewModel viewModel) {
         this.viewModel = viewModel;
     }
+
+    public ShoppingListViewModel getViewModel() {
+        return viewModel;
+    }
+
     public abstract void putIngredient(FormalIngredient ingredient);
     public abstract void putIngredient(FormalIngredient ingredient, Recipe recipe);
     public abstract void putIngredient(FormalIngredient ingredient, String recipeName);
-    public abstract void putArbitraryItem(String name);
+    public abstract void putArbitraryItem(Double amount, String name, Unit unit);
 
     public abstract FormalIngredient purgeIngredient(Long id);
     public abstract FormalIngredient purgeIngredient(String ingredientName);
 
     public abstract void reset();
 
-    public abstract List<Pair<FormalIngredient, Optional<String>>> getItems();
+    public abstract List<ShopListItem> getItems();
     public abstract String makePrintable();
 }
diff --git a/client/src/main/java/client/service/ShoppingListServiceImpl.java b/client/src/main/java/client/service/ShoppingListServiceImpl.java
new file mode 100644
index 0000000..03a23f6
--- /dev/null
+++ b/client/src/main/java/client/service/ShoppingListServiceImpl.java
@@ -0,0 +1,65 @@
+package client.service;
+
+import com.google.inject.Inject;
+import commons.FormalIngredient;
+import commons.Recipe;
+import commons.Unit;
+import org.apache.commons.lang3.NotImplementedException;
+
+import java.util.List;
+
+public class ShoppingListServiceImpl extends ShoppingListService {
+    @Inject
+    public ShoppingListServiceImpl(ShoppingListViewModel viewModel) {
+        super(viewModel);
+    }
+
+    @Override
+    public void putIngredient(FormalIngredient ingredient) {
+        getViewModel().add(ingredient);
+    }
+
+    @Override
+    public void putIngredient(FormalIngredient ingredient, Recipe recipe) {
+        putIngredient(ingredient, recipe.getName());
+    }
+
+    @Override
+    public void putIngredient(FormalIngredient ingredient, String recipeName) {
+        getViewModel().add(ingredient, recipeName);
+    }
+
+    @Override
+    public void putArbitraryItem(Double amount, String name, Unit unit) {
+        throw new NotImplementedException();
+    }
+
+    @Override
+    public FormalIngredient purgeIngredient(Long id) {
+        FormalIngredient i = getViewModel().get(id).getIngredient();
+        getViewModel().delete(id);
+        return i;
+    }
+
+    @Override
+    public FormalIngredient purgeIngredient(String ingredientName) {
+        FormalIngredient i = getViewModel().get(ingredientName).getIngredient();
+        getViewModel().delete(ingredientName);
+        return i;
+    }
+
+    @Override
+    public void reset() {
+        throw new NotImplementedException();
+    }
+
+    @Override
+    public List<ShopListItem> getItems() {
+        return getViewModel().getListItems();
+    }
+
+    @Override
+    public String makePrintable() {
+        return "";
+    }
+}
diff --git a/client/src/main/java/client/service/ShoppingListViewModel.java b/client/src/main/java/client/service/ShoppingListViewModel.java
index 30e03df..7bce792 100644
--- a/client/src/main/java/client/service/ShoppingListViewModel.java
+++ b/client/src/main/java/client/service/ShoppingListViewModel.java
@@ -4,19 +4,49 @@ import commons.FormalIngredient;
 import javafx.beans.property.ListProperty;
 import javafx.beans.property.SimpleListProperty;
 import javafx.collections.FXCollections;
-import javafx.util.Pair;
+import javafx.collections.ObservableList;
 import org.apache.commons.lang3.NotImplementedException;
-
-import java.util.Optional;
+import java.util.function.Predicate;
 
 public class ShoppingListViewModel {
     /**
      * The formal ingredient provides the ingredient and its amount,
      * and the string (optional) describes the recipe where it came from.
      */
-    private final ListProperty<Pair<FormalIngredient, Optional<String>>> listItems = new SimpleListProperty<>(FXCollections.observableArrayList());
+    private final ListProperty<ShopListItem> listItems = new SimpleListProperty<>(FXCollections.observableArrayList());
     public void addArbitrary() {
         throw new NotImplementedException();
     }
+    public void add(FormalIngredient formalIngredient) {
+        listItems.get().add(new ShopListItem(formalIngredient));
+    }
+    public void add(FormalIngredient formalIngredient, String recipeName) {
+        listItems.get().add(new ShopListItem(formalIngredient, recipeName));
+    }
+    public ShopListItem get(Long id) {
+        return get(item -> item.getIngredient().getId().equals(id));
+    }
+    private ShopListItem get(Predicate<ShopListItem> matcher) {
+        return listItems.get().stream()
+                .filter(matcher)
+                .findFirst()
+                .orElseThrow(NullPointerException::new);
+    }
+    public ShopListItem get(String recipeName) {
+        return get(i -> i.getRefRecipeName().equals(recipeName));
+    }
+    public void delete(Long id) {
+        throw new NotImplementedException();
+    }
 
+    public ObservableList<ShopListItem> getListItems() {
+        return listItems.get();
+    }
+
+    /**
+     * Deleting an item of name which is not associated to any recipe.
+     * @param name the name of the ingredient
+     */
+    public void delete(String name) {
+    }
 }