Sweet corn and potato stir fry

Name: Sweet corn and potato stir fry
Ingredients: 1 large corn maize grated(boiled.); 2 medium sized potato boiled and peeled); 1 tablespoon oil; 1 tablespoon mustard seeds; 1 teaspoon cumin seeds; 10-12 curry leaves; 1 teaspoon vinegar; 1 inch ginger minced or paste; 3 green chillies chopped; 1 teaspoon lemon juice; 1/2-1 teaspoon sugar; 1/4 tsp turmeric powder; 1 medium sized chopped onion; 1/2 teaspoon garam masala powder; 1 pinch hing; 5 onion leaves; to taste Salt; 4 tsp mayonnaise; For mixing:; as needed Little bhujia and peanuts; as needed Onion leaves for garnishing