Basic Curry Sauce

INGREDIENTS

• 2 tablespoons peanut oil
• 1 tablespoon margarine
• 1 large onion, chopped
• 1 tablespoon minced fresh ginger root
• 2 tablespoons minced garlic
• 1 teaspoon ground cinnamon
• 1 teaspoon ground black pepper
• 2 tablespoons ground coriander
• 2 tablespoons ground cumin
• 1/4 teaspoon ground turmeric
• 1 teaspoon cayenne pepper
• 2 tomatoes
• 2 serrano chile peppers, seeded
• 1/2 cup fresh cilantro
• 1/2 cup yogurt, whisked until smooth
• 3 cups water