Eggs Poached in Curried Tomato Sauce

Name: Eggs Poached in Curried Tomato Sauce
Ingredients: 1/2 tablespoon tamarind paste, or a 1/2-inch ball of tamarind pulp (1/4 ounce) plus 1/4 cup warm water, or 1 tablespoon fresh lemon juice; 2 teaspoons canola oil; 1 shallot, chopped; 1 garlic clove, minced; 1 small serrano pepper, minced more to taste, or 1/2 teaspoon chili powder; 1/2 teaspoon ground cumin; 1/4 teaspoon ground coriander; 1/2 teaspoon curry powder (optional); 1 (14-ounce) can diced tomatoes in juice; Salt; freshly ground pepper; Pinch of cayenne; 1 to 2 eggs; 1 tablespoon chopped cilantro; 3/4 cup cooked basmati rice