Heat oil in a saucepan over medium heat. Add onion, garlic, salt and pepper cook, stirring frequently, until onion is translucent, about 3-5 minute
To ensure crispy bread butter both sides of the bread.
Then layer sandwiches with onion, tomatoes, cheese slices or grated cheese, chutney, you may season with pepper, if using store bought chutney
Cover with the remaining slices of bread.
Preheat grill pan or large skillet over medium heat. Cook sandwiches 3 minutes per side or until bread is golden brown and cheese is melted.
Clean barbecue of any remaining food after grilling, if necessary oil grill with paper towel dipped in a little bit of oil,
Place the sandwiches on the grill or inside a barbeque basket, it really helps facilitate flipping the sandwich around if you are a novice, slowly grill until they are golden brown and cheese has melted, about 2 minutes or more per side, depending on grill. Be careful when grilling because they grill up fast.