Marinate the prawns with lemon juice and salt for 10 minutes. Then layer the prawns on all sides with the minced green chillies and garlic. Sprinkle some garam masala and pepper on the prawns. Leave the prawns aside for another 10 minutes. Meanwhile pre-heat the microwave to 200 degrees. Stick the marinated prawns with capsicum, tomatoes and onions into the stakes. Drizzle some oil on the stakes and fix them inside the microwave. Now grill the prawns for 10 minutes on 60 percent power. Remove the prawn kebabs from the stakes after they are cooked, and serve them with salad.