In a bowl, take the thick curd and add roasted besan, ginger-garlic paste, turmeric powder, red chilli powder, a little lemon juice, coriander-cumin powder, garam masala, chaat masala, salt to taste, dried fenugreek leaves, and ghee. Mix everything well.
Next, add the onion, tomato, capsicum cubes, and the par-boiled potato cubes to the marinade. Combine them thoroughly so that all the vegetables are well coated.
Take a skewer and arrange the marinated vegetables and potatoes on it.
Grill the skewers over an open flame until they are nicely charred.
Once you see some char marks, brush melted butter over the skewers and grill them again over the open flame.
Your restaurant-style Tandoori Aloo is now ready to be served.
