Dahl Soup

Name: Dahl Soup
Ingredients: 2 tablespoons butter; 2 garlic cloves, crushed; 1 onion, chopped; 1⁄2 teaspoon turmeric; 1 teaspoon garam masala; 1⁄4 teaspoon chili powder; 1 teaspoon cumin; 2 1⁄4 lbs canned chopped tomatoes, drained; 1 cup red lentil; 2 teaspoons lemon juice; 2 1⁄2 cups vegetable stock; 1 1⁄4 cups coconut milk; salt and pepper; cilantro, chopped, to garnish