Easy Chicken Madras Recipe

Name: Easy Chicken Madras Recipe
Ingredients: 2 onions, coarsely chopped; 2 red chile peppers, stemmed and seeded; 1 (2 inch) piece fresh ginger, grated; 2 cloves garlic; 1 splash water, or as needed; salt and ground black pepper to taste; 1 tablespoon vegetable oil; 0.25 cup Madras curry powder; 4 skinless, boneless chicken breasts, cut into large chunks; 1 (14 ounce) can chopped tomatoes; 0.5 cup chopped cilantro, or to taste