Green Apple Curry

Some months ago we were presented with a whole basket of lovely green apples.  They were sour and had a tang to it.  So I made them into salads, cakes, tarts and what not.  One recipe I found was quite unusual and it caught my fancy.  Made it and the rest is history.  Try out this lip smacking Green Apple Curry and surprise your friends and family.
 
The Recipe:

4 medium green apples cored and cubed, soak in water with a teaspoon of salt to prevent it from becoming brown; 1 large onion, sliced; 3 flakes garlic, minced; 1 inch piece ginger, minced; 1 dsp curry powder of your choice; 1 tbsp vinegar; mustard and curry leaves for seasoning; 2 dsp olive oil; 1 large tomato, diced; 1/2 tsp sugar to taste.

Heat oil and add the mustard seeds.  When they crackle add the curry leaves, onions, ginger and garlic.  Stir fry till onions become golden brown on a medium fire.  Add the tomatoes and cook till mushy.  Now add the  curry powder, salt to taste, vinegar and the sugar .  Mix well, add the apples, 1/4 cup water and cover and cook for 5 minutes or until apples are soft but still retaining their shape. Taste and add more sugar if required.  It should be spicy, sweet and sour all at the same time.  If you have achieved that you a cook to reckon with.  Serve hot with curd rice or any Indian bread.