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Ingredients

• About 1/2 cup olive oil
• 1 tablespoon plus 1/4 teaspoon finely chopped fresh thyme
• 1 teaspoon freshly grated lemon zest
• 1/2 pound (about 5 medium) portobello mushrooms, stems removed
• Sea salt and freshly ground black pepper
• 1 pound asparagus
• 2 pounds coarsely ground chuck, chilled
• 1/2 cup finely chopped red onion
• 1 tablespoon Dijon mustard
• 1/2 cup mayonnaise
• 4 ciabatta buns
• 4 large slices (about 6 ounces) Brie cheese
• 1 large ripe tomato, thickly sliced

Description

Serious Eats