Green chicken with gravy

Name: Green chicken with gravy
Ingredients: 500 grams fresh chicken; 1 medium size onion; 3-4 tablespoons thick Greek yoghurt; 3-4 garlic pods; 1 teaspoon kasuri methi; 1 teaspoon salt; 1/2 teaspoon black pepper powder; 1/2 teaspoon Garam masala powder; 2-3 green chili’s; 1/2 bunch coriander leaves; 4-5 mint sprigs; 1/2 teaspoon green food color (optional); 3 tablespoons cashews; 2 tablespoons desiccated coconut powder; 1 teaspoon charoli seeds (chironji); 1/2 glass water for cooking; 3-4 tablespoons oil