Foryoueats: Chicken Nanban (Fried Chicken with Tartar Sauce)

Ingredients

• For the Tartar Sauce:
• 1 large egg (50 g each w/o shell)
• ¼ onion (1.8 oz, 50 g)
• ½ Japanese or Persian cucumber (1.8 oz, 50 g; about 4 Tbsp, finely chopped; if you don’t have a fresh cucumber, you can use a pickled cucumber and omit the rice vinegar below)
• 3 Tbsp Japanese Kewpie mayonnaise
• 1 tsp rice vinegar (unseasoned) (I used Mizkan Natural Rice Vinegar)
• ⅛ tsp Diamond Crystal kosher salt
• ⅛ tsp freshly ground black pepper
• For the Nanban Sauce:
• 2 Tbsp soy sauce
• 2 Tbsp rice vinegar (unseasoned) (I used Mizkan Natural Rice Vinegar)
• 2 Tbsp sugar
• 1 Tbsp mirin
• For the Fried Chicken:
• 1 boneless, skinless chicken breast (10.5 oz, 300 g)
• 1 Tbsp all-purpose flour (plain flour) (plus more, if needed)
• 2 cups neutral oil (for deep-frying)