Step 1

Take a small bowl. Add olive oil, mayonnaise, lime juice, mustard sauce, garlic powder, tomato sauce, salt, and pepper. Whisk these ingredients well.

Step 2

Dip the chicken pieces in the marinade and mix well. Keep them in the marinade for around thirty minutes.

Step 3

Cut the brioche buns into half. Smear butter on the cut-sides down. Toast them using a tong in a skillet for about 10 seconds each.

Step 4

Preheat the grill over medium flame. Take out the marinated chicken and grill both sides using a tong for about 3-4 minutes.

Step 5

Take a half bun and apply a teaspoon of mayonnaise. Layer it with lettuce, chicken, tomato and onions. Top with the other bun. Serve with tomato sauce.