Brown Button Mushroom Masala

250gms brown button mushroom1 tsp fennel  seeds,coarsely pounded5 pods cardamom1 bay leaf3 medium onions-chopped3 large tomatoes(blanched in hot water and peel of the skin,chopped and keep aside)2 tsp ginger paste2 tsp garlic paste1 tbsp sugar1 tbsp sugar1 tbsp vinegar½ tsp freshly grounded black pepper½ tsp turmeric powder1 tsp nutmeg powder½ tsp green cardamom powderSalt to t