Moroccan Black-Eyed Peas (Cowpeas)

Ingredients

• 1 1/2 cups dried black-eyed peas (cowpeas)
• 1 onion, chopped
• 1 (8 ounce) can tomato sauce
• 1/2 cup olive oil
• 1/4 cup chopped fresh cilantro
• 3 cloves garlic, finely chopped
• 1 1/2 teaspoons salt
• 1 1/2 teaspoons ground cumin
• 1 1/2 teaspoons sweet paprika
• 1 teaspoon ground ginger
• 1/4 teaspoon cayenne pepper
• 3 1/2 cups water, or more if needed