Ingredients
- 1/3 cup(s) light mayonnaise
- 1/4 cup(s) loosely packed fresh parsley leaves, finely chopped
- 1 small clove garlic, crushed with press
- Salt
- Pepper
- 2 teaspoon(s) olive oil
- 1 medium (6- to 8-ounce) red onion, cut in half, thinly sliced
- 4 ounce(s) mushrooms, sliced
- 1/2 cup(s) water
- 1 teaspoon(s) sugar
- 1.25 pound(s) 85-percent lean ground beef
- 1 ounce(s) Gruyère cheese, shredded
- 4 brioche hamburger buns, toasted
- 4 leaves Boston lettuce
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