Aloo Bangain (Eggplant & Potato Curry)

Aloo Bangain (Potato and Eggplant Curry) 1 Eggplant,medium (cubed) 2 Potatoes, medium ( peeled and cubed) 1 Tomato, small (cubed) 1 Onion, small (diced) 1 tbsp Ketchup 3 tbsp Vegetable oil 1 tbsp White Vinegar 1/2 cup Water 1/2 tsp Salt (or to taste) 1/2 tsp Red pepper (laal mirch) 1/2 tsp Garam Masala 1…