Chicken-Fried Oyster Sandwich

INGREDIENTS

• Zest of 1 lemon
• 1 tablespoon Sriracha chili sauce (more if you're feeling feisty!)
• 4 sesame-seed hamburger buns
• 6 heaping tablespoons tartar sauce
• 1 cup buttermilk
• Vegetable oil, for frying
• 12 jumbo oysters, shucked (8 if they are huge beach oysters)
• 2 heaping tablespoons finely diced salty gherkins
• 2 cups all-purpose flour, for dredging
• 2 cups finely sliced (chiffonade) romaine lettuce
• 1 tightly packed tablespoon finely chopped capers
• Juice of 1/2 lemon
• 1 cup real mayonnaise
• Pinch kosher salt