Crispy Tempura Soft-Shell Crab Brioche Sandwich Step-by-step instructions

Before you start

Before starting, ensure all your ingredients are measured and ready to go. The frying process moves very quickly, so have your batter whisked and your yuzu mayo mixed before you even turn on the oil.

Prepare your workspace by laying out paper towels for draining the crab and have your toasted buns ready to assemble. If you are cleaning the crabs yourself, handle them carefully and ensure they are patted completely dry with paper towels to prevent oil splatter.

Instructions

Batter and sauce prep

1. 1Prepare the components
   In a small bowl, whisk together the mayonnaise, yuzu kosho, and a squeeze of lime juice until well combined. Set this aside. In a separate bowl, whisk the ice-cold sparkling water and rice flour together until just combined; the batter should remain slightly lumpy to ensure maximum crispiness during frying.
   Look for The batter should be thin and cold.
   Tip Keep the sparkling water in the fridge until the very last second.

The yuzu mayo should be smooth, creamy, and have a vibrant, citrusy aroma. The tempura batter should be thin, cold, and have a few visible lumps of flour remaining; these lumps are essential for the desired texture. Ensure your workspace is clear and your frying oil is heating up to the correct temperature before proceeding to the next step.

Frying to perfection

2. 2Fry the crab
   Heat your frying oil to 375°F (190°C). Carefully dip the cleaned soft-shell blue crab into the tempura batter, ensuring it is lightly and evenly coated. Carefully lower the crab into the hot oil. Fry for approximately 3 minutes until the shell puffs up and turns a beautiful golden brown, reaching an internal temperature of 145°F (63°C). Remove carefully and immediately dust with the matcha salt.
   Look for The shell will look puffed and golden.
   Safe temperature 145°F (63°C) internal temperature (shellfish)
   Tip Do not crowd the pot if frying more than one crab.

The crab should sizzle immediately upon contact with the oil. Watch for the batter to puff up into a delicate, golden-brown crust. The crab should smell toasted and fresh. Once it reaches 145°F (63°C) and looks perfectly crispy, remove it from the oil and let it drain briefly on a wire rack to maintain the crunch.

Final sandwich assembly

3. 3Assemble the sandwich
   Toast the brioche bun until lightly golden and crisp. Spread a generous layer of the prepared yuzu kosho mayo on both halves of the bun. Place the hot, crispy fried soft-shell crab on the bottom bun. Top with the pickled radish slaw, cover with the top bun, and press down lightly before slicing in half to reveal the texture.
   Look for The bun should be warm and crispy.
   Tip Assemble immediately before serving to keep the crab from getting soggy.

The brioche bun should be toasted to a light golden brown with a slight crunch. As you assemble, the mayo should spread easily, and the radish slaw should provide a crisp, refreshing bite.

When you slice through the sandwich, you should hear a distinct, satisfying crunch, indicating that the tempura coating is perfectly executed and ready to eat.

Common mistakes

A common mistake is using lukewarm water for the batter, which results in a dense, greasy coating. Always use ice-cold water. Another error is failing to dry the crab properly before dipping it into the batter; excess moisture will cause the batter to slide off during frying.

Finally, avoid frying at a temperature lower than 375°F, as this will lead to a soggy, oil-soaked sandwich rather than a crisp, light, and airy result.

How to tell it’s done

The soft-shell crab is done when the tempura batter is uniformly golden brown and appears light and puffed. Because the crab is thin, it cooks through very rapidly.

The internal temperature of the crab meat must reach 145°F (63°C) to be safely cooked. You will know it is ready by the loud, audible crunch when you slice into it. The meat inside should be opaque and tender, not rubbery or tough.

• Shellfish: 145°F (63°C) in the thickest part