Bittergourd Masala | Bittergourd In Spicy Tangy Sauce

Ingredients:

300 grams karela or bittergourd
1 big onion sliced 
1 medium tomato chopped 
1 small pod garlic 
1 and half tbsp besan or gramflour
1 inch ginger 
few coriander leaves 
1 tsp red chilli powder 
1 tbsp coriander powder 
1 tsp cumin powder 
1 tsp garam masala powder 
1/2 tsp turmeric 
salt to taste 
1 small lemon sized ball of tamarind 
1 small piece of jaggery