Grilled Portabella Burger With Basil Mayonnaise - cooking recipe

Ingredients

1/4 cup fresh basil, chopped
3 tablespoons vegan mayonnaise
1 teaspoon apple cider vinegar
4 portabella mushroom caps (about 1 pound)
2 teaspoons olive oil
1/8 teaspoon sea salt (or to taste)
1/8 teaspoon black pepper (or to taste)
4 mixed-grain hamburger buns
4 pieces roasted red peppers, drained (jarred water-packed)
4 slices red onions
4 leaves romaine lettuce

Preparation

Heat grill or grill pan.
In a small bowl, combine basil, vegan mayonnaise, and vinegar; set aside.
Lightly coat both sides of mushroom caps with olive oil.
Season with salt and pepper, if desired.
Grill mushrooms over medium-high heat, until just soft to the touch, about 6 minutes per side.
To serve, split buns and toast on grill.
Spread a heaping teaspoon of the basil mixture on top and bottom halves of buns.
Layer each bottom half with one lettuce leaf, red pepper,.
mushroom, and onion slice; top with remaining half bun.
and serve.