Ingredients

1 tablespoon red-wine vinegar 

2 cloves garlic, coarsely chopped 

1/2 cup watercress, leaves and some stems 

3 tablespoons fresh lemon juice 

2 cherry tomatoes, quartered 

1 scallion, cut in 1/2-inch lengths 

4 Nicoise olives, pitted 

3 anchovy fillets, rinsed and dried 

1 teaspoon capers 

1/2 teaspoon salt 

1/4 teaspoon freshly ground black pepper 

1/2 cup extra-virgin olive oil 

Preparation

Combine all ingredients except oil in a blender; finely chop. With blender running, slowly add oil until completely incorporated.