Ingredients
- 1 Tbsp. Dijon mustard
- 2 tsp. Worcestershire sauce
- 2 garlic cloves, finely grated
- 2 Tbsp. plus 2 tsp. fresh lemon juice
- 2 tsp. freshly ground black pepper, plus more
- ⅓ cup plus 2 tsp. extra-virgin olive oil, plus more for grill
- 6 Tbsp. mayonnaise
- ¼ cup chopped cornichons (about 9)
- Kosher salt
- 4 large or 6 small skinless, boneless chicken thighs (about 1½ lb. total)
- 4 brioche buns, split
- 1 medium fennel bulb, thinly sliced crosswise, fronds reserved
- 1 cup basil leaves
- ¼ tsp. crushed red pepper flakes (optional)
- 1 small head Little Gem lettuce
- 1 medium tomato, sliced ¼" thick
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