Beet
Beet: 1 small roasted beet, pureed until smooth (about 3 tablespoons)
Saffron
Saffron: 1/4 teaspoon saffron threads, crushed and soaked in 2 Tbsp. warm water for 30 minutes.
Spinach
Spinach: 1/2 of a 10-oz. pkg. frozen chopped spinach, thawed, squeezed dry, and finely chopped.
Roasted Red Pepper
Roasted Red Pepper: 1/2 of a roasted red sweet pepper, pureed until smooth (about 3 tablespoons).