Ingredient:

• 1 tablespoon olive oil
• 1 tablespoon butter
• 1 teaspoon cumin seeds
• 3 green cardamom pods
• 2 whole cloves
• 1 cinnamon stick
• 1 bay leaf
• ½ onion, grated
• 1 (2 inch) piece ginger root, peeled and grated
• 1 clove garlic, crushed
• 1 (14.5 ounce) can diced tomatoes
• 1 teaspoon ground coriander
• ½ teaspoon ground turmeric
• ½ teaspoon ground cumin
• ½ teaspoon garam masala
• ½ teaspoon cayenne pepper (Optional)
• ½ teaspoon salt, or to taste
• ¼ cup whole milk yogurt
• 24 frozen meatless vegetable meatballs (such as IKEA®'s frozen vegetable balls)
• ¼ cup hot water, or as needed