Marvel's Japanese Fried Oysters (Kaki Fuh-rai) with Lemony Tartar Sauce

INGREDIENTS

• 1 cup mayonnaise
• 1/2 lemon, juiced and zested
• 1/4 dill pickle spear, seeded and minced
• 1/4 teaspoon cayenne pepper
•  
• 1 cup panko (Japanese bread crumbs)
• 1/8 teaspoon cayenne pepper
• salt and ground black pepper to taste
• 2 cups canola oil
• 6 shucked oysters, or more if desired
• 1 egg, beaten