Falafel with a Creamy White Bean Yogurt Sauce
2 1/4 cups cooked chickpeas
3 scallions, coarsely chopped
1 large clove garlic, coarsely chopped
1 1/2 teaspoons ground cumin
1 1/2 teaspoons ground coriander
3/4 teaspoon cayenne pepper
Generous 1/4 cup coarsely chopped parsley
Generous 1/4 cup...