Butter Chickpea Curry

Name: Butter Chickpea Curry
Ingredients: 4 tablespoons butter, divided; 1 large onion, finely chopped; 3 cloves garlic, minced or presses; 1 tablespoon freshly grated ginger; 2 tablespoons garam masala powder (a little less if you use the paste); 2 teaspoons mild curry powder; 1 teaspoon turmeric; 1 teaspoon cayenne pepper (adjust to taste); 1/4 teaspoon ground cumin; 1/4 teaspoon salt; 170 g tomato paste; 1 can (400 g) diced tomatoes; 1 can (400 g) full fat coconut milk; 3 cans (440 g) chickpeas, drained and rinsed; 1 tablespoon cornstarch; 4 tablespoons heavy cream; Chopped cilantro or parsley as garnish