"Takeaways: the great British institution. We love them. In fact, all of us, on average, have 2 takeaways a week. I love them, too. They're delicious, but should be an occasional treat. I love Indian food and I discovered Madras whilst at an Indian restaurant. It comes from a region known as Madras in southern India, which is now modern-day Chennai. This is a perfect swap - with fewer calories! Serve with a big spoonful of basmati rice, yogurt, and a fluffy naan."
Place onions, chile peppers, ginger, and garlic in a blender with a splash of water. Blend into a smooth paste; season with salt and pepper.
Heat oil in a large, high-sided pan over medium heat. Cook paste until slightly browned, about 5 minutes.
Heat a small skillet over medium-low heat. Add Madras curry powder; cook and stir until fragrant, 2 to 3 minutes. Mix into the paste.
Cook and stir chicken in the spice paste mixture until browned, 5 to 10 minutes. Pour in tomatoes. Fill the tomato can halfway with water and pour in too. Simmer over medium-low heat until liquid is reduced, about 50 minutes. Season with salt and pepper. Scatter cilantro on top.