Combine live oil, vinegar, honey, dried oregano and salt in a small bowl, mix well and apply this mixture on both sides of paneer roundels. Keep aside for ten to fifteen minutes.
Roast tomatoes, onion, green capsicum and garlic on a pan till lightly charred. Remove from heat, when cool grind the same coarsely. Transfer into a bowl, add jalapeno pepper, chilli flakes, lemon juice, salt and coriander leaves, mix well and keep aside.
Place a paneer roundel on a flat working surface, place a spoonful of salsa over the paneer and spread gently and then cover with another roundel of paneer to make a sandwich. Similarly prepare the rest of the sandwiches using the remaining paneer and salsa.
Preheat a grill. Place prepared sandwiches on a rack, baste with butter and grill till golden. Turn over and continue to grill till both sides are golden. Serve hot