2 pounds skinless, boneless chicken breast, cut in bite-sized pieces
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3 medium tomatoes, chopped
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5 fresh bird’s eye chiles, minced
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½ cup tomato sauce
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1 pinch red pepper flakes, or to taste
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salt and ground black pepper to taste
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¼ cup chicken broth, or more as needed
Instructions
Mix vinegar, ginger, garam masala, mustard powder, cayenne pepper, cumin, turmeric, coriander, sugar, and cinnamon together until a paste forms. Set aside.
Process red onions and garlic in a food processor until minced.
Melt butter in a large frying pan over medium heat. Add onion-garlic mixture and saute until translucent, 5 to 7 minutes, stirring constantly so the garlic doesn't burn. Add chicken and cook, stirring occasionally, for 4 to 5 minutes.
Add tomatoes, chile peppers, and tomato sauce. Stir in the reserved spice paste and bring to a boil. Lower heat and simmer, stirring occasionally, for 1 1/2 to 2 hours, adding pepper flakes, salt, and pepper while cooking. Stir in chicken broth as needed if vindaloo gets too dry.