1: Cut the paneer, bell pepper, and onion into cubes.
2: In a bowl, mix the curd, ginger garlic paste, ajwain, kashmiri red chili powder, turmeric powder, coriander powder, cumin powder, garam masala, lemon juice, mustard oil, and salt to prepare the marinade.
3: Add paneer, bell pepper, and onion to the marinade and mix well. Let it marinate for at least 30 minutes.
4: Preheat the grill or oven.
5: Skew the marinated paneer, bell pepper, and onion onto skewers.
6: Brush with butter and grill for 15 minutes until cooked.
7: Garnish with mint leaves, onion slices, and lemon wedges before serving.