Watercress And Pistachios Pesto - cooking recipe

Ingredients

6 cups watercress, packed
1/2 cup pistachios, toasted
1/2 cup parmegianao reggiano parmesan cheese, grated
4 teaspoons lemon juice
2 garlic cloves, peeled
1/2 cup canola oil, approximately
salt

Preparation

In a food processor, finely chop all ingredients except the oil. Incorporate the oil in the whole of the food processor while it's on until you have a creamy consistancy and lightly grainy. Add salt to taste.