About this recipe:This is a wonderful vegetarian burger, packed full of flavour. Portobello mushrooms are barbecued and served in a burger bun with mayo, basil, lettuce and tomato. Try adding cheese at the end to make them into cheeseburgers.
75ml balsamic vinegar
4 tablespoons olive oil
1 tablespoon finely chopped garlic
6 portabello mushroom caps
1 tablespoon Dijon mustard
1 teaspoon lemon juice
2 tablespoons chopped fresh basil
6 burger buns, split and toasted
6 leaves lettuce
6 tomato slices
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Method Prep:15min › Cook:10min › Ready in:25min
Preheat barbecue for medium heat and lightly oil the cooking grate. Whisk together the balsamic vinegar, olive oil and garlic in a small bowl.
Arrange the portabello mushrooms gill-side up on a baking tray. Brush the mushrooms with some of the vinegar mixture and allow to marinate for 3 to 5 minutes.
Place the marinated mushrooms on the preheated barbecue, gill-side down. Grill mushrooms until tender, brushing both sides of the mushrooms with the remaining marinade, about 4 minutes on each side.
Mix the mayonnaise, Dijon mustard, lemon juice and basil in a small bowl. Butter the toasted rolls, then spread with the mayonnaise mixture. Divide the mushrooms, lettuce and tomato slices evenly to make 6 sandwiches.