Crispy Shrimp Sandwich with Pickled Cabbage

Every part of a fried shrimp sandwich is a moisture problem. Shrimp release water as they cook, cabbage holds water by nature, and bread soaks up whatever reaches it. Get the water wrong at any point and the crisp coating goes soft before the first bite. This crispy shrimp sandwich with pickled cabbage is built around controlling that water: a dry-then-coated shrimp, a quick cabbage pickle that you drain well, and a toasted roll.

What is documented and what is not: fried shrimp sandwiches with pickled vegetables are a well-established dish, and the breading mix, the frying temperature and time, and the pickling methods here follow published recipes I found. The pairing with red cabbage, the proportions of the brine, the oil depth and the shorter buttermilk soak are my own adaptation, which I have not tested in a test kitchen. Use the visual cues in the steps along with the times.

Managing the Water in a Fried Shrimp Sandwich

Three controls matter. First, the coating. The published fried shrimp banh mi I followed dips shrimp in a buttermilk mixture, then dredges them in a blend of panko, flour and cornstarch. Flour sticks to the wet surface, and the panko adds the crunchy outer layer. Shake off the excess so the crust is thin rather than doughy.

Second, the oil. The same recipe fries at 175°C (350°F) for about 2 minutes per side. Oil that is too cool lets the coating soak up fat, and oil that is too hot browns the outside before the shrimp inside is cooked. A thermometer removes the guesswork.

Third, the cabbage. Quick-pickled cabbage sheds brine, so drain it in a sieve and press lightly before it goes on the sandwich. Brine dripping onto the shrimp is an easy way to lose the crunch.

Ingredients

Pickled Cabbage

• 200 g (3 packed cups) red cabbage, thinly shredded
• 30 g (1/4 cup) thinly sliced red onion
• 120 ml (1/2 cup) apple cider vinegar
• 120 ml (1/2 cup) water
• 2 teaspoons sugar
• 1 teaspoon fine salt

Crispy Shrimp

• 450 g (1 lb) large peeled and deveined shrimp
• 240 ml (1 cup) buttermilk
• 1/2 teaspoon hot sauce
• 1 teaspoon Creole or Cajun seasoning, divided
• 125 g (1 cup) all-purpose flour
• 60 g (1 cup) panko
• 30 g (4 tablespoons) cornstarch
• Neutral oil for frying, about 2.5 cm (1 inch) deep in the pan

Sandwich

• 4 soft baguette or sub rolls, about 20 cm (8 inches), split
• 60 g (4 tablespoons) mayonnaise mixed with 1 teaspoon sriracha and 1 teaspoon lime juice
• Sliced jalapeño, cilantro and lettuce leaves

Frozen shrimp work if fully thawed in the refrigerator and patted very dry. White cabbage can replace the red.

Instructions

1. Start the pickle. Put the cabbage and onion in a heatproof bowl. Heat the vinegar, water, sugar and salt in a small pot over medium heat for about 1 minute, until the sugar and salt dissolve. Pour it over the cabbage, press the cabbage under the liquid, and leave for at least 30 minutes. The cabbage will turn bright pink and soften slightly.
2. Soak the shrimp. Whisk the buttermilk, hot sauce and 1/2 teaspoon of the seasoning in a bowl. Add the shrimp and refrigerate for 15 minutes.
3. Set up the dredge. In a shallow dish, mix the flour, panko, cornstarch and the remaining seasoning.
4. Heat the oil. Pour oil about 2.5 cm (1 inch) deep into a heavy 28 cm (11 inch) skillet and heat to 175°C (350°F). A breadcrumb should sizzle steadily the moment it hits the oil.
5. Coat the shrimp. Lift each shrimp from the buttermilk, let the excess drip off, press it into the dredge on both sides and shake lightly. Work in batches so the coating stays dry.
6. Fry in batches. Lower 6 to 8 shrimp into the oil, leaving space between them. Fry about 2 minutes per side, until deep golden and crisp, with a steady, lively sizzle. The shrimp should be pearly or white, and opaque, inside.
7. Drain. Lift the shrimp onto a wire rack set over a baking sheet and sprinkle with a pinch of salt. Let the oil return to 175°C (350°F) before the next batch.
8. Toast the rolls. While the last batch fries, toast the cut sides in a dry skillet or the oven for 1 to 2 minutes, until lightly golden.
9. Drain the cabbage. Tip the pickle into a sieve and press out the extra brine.
10. Assemble. Spread the spicy mayonnaise on both halves of each roll. Add lettuce, shrimp, a pile of cabbage, jalapeño and cilantro. Close and serve right away.

Crispy Shrimp Sandwich with Pickled Cabbage: How to Know the Shrimp Is Done

Fry coated shrimp in 175°C (350°F) oil for about 2 minutes per side. They are done when the coating is deep golden and the flesh is pearly or white, and opaque. Take them out at once, since shrimp overcook quickly, and drain them on a wire rack, not a plate.

The pearly-white and opaque description of cooked shrimp comes from foodsafety.gov, which gives no temperature for shellfish. The 2-minutes-per-side figure comes from the banh mi recipe I followed. Your shrimp size and pan will change the timing slightly, so cut one open on the first batch and look.

Mastering the Fry

Oil temperature drops when cold food goes in. Fry only 6 to 8 shrimp at a time, and wait for the oil to climb back to 175°C (350°F) between batches. If the oil is smoking, it is too hot. Take the pan off the heat for a minute.

Use a heavy pan, and keep a lid nearby. Never leave hot oil unattended, and never add water to it. Lower shrimp in with tongs, moving the shrimp away from you.

Quick-Pickling the Cabbage

The pickle is a hot brine poured over raw cabbage. The banh mi recipe I read lets carrots, cucumber and radish stand for 30 minutes, then refrigerates them for up to 48 hours. A shredded red cabbage recipe I read pickles for at least 1 hour in the refrigerator and keeps for about 2 weeks. That recipe uses a larger amount of brine and a bit more salt than mine, so the shelf life may not carry over to this smaller batch. Keep the cabbage submerged and eat it within a few days.

For a crunchier cabbage, use the 30-minute stand. For a softer, milder one, leave it an hour or longer.

Troubleshooting: Problem, Cause, Fix

• Problem: the coating slides off. Cause: wet shrimp or too much buttermilk. Fix: let the excess drip, and press the shrimp firmly into the dredge.
• Problem: pale, greasy shrimp. Cause: oil below 175°C (350°F). Fix: check with a thermometer and fry in smaller batches.
• Problem: dark crust, translucent center. Cause: oil too hot. Fix: lower the heat and cut the first shrimp open to check.
• Problem: rubbery shrimp. Cause: fried too long. Fix: remove at the first sign of deep golden color.
• Problem: soggy roll. Cause: wet cabbage or untoasted bread. Fix: press the cabbage in a sieve and toast the rolls.

Variations and Serving

• Banh mi style: Add sliced cucumber and mint, as the banh mi recipe does.
• Remoulade: Swap the spicy mayonnaise for a remoulade, which one po’boy recipe I read pairs with its fried shrimp.
• On greens: Pile the shrimp and cabbage over lettuce for a sandwich-free bowl.

A published po’boy recipe calls the bread nearly as important as the shrimp, and recommends a baguette with a crisp exterior and fluffy interior. I agree.

Storing and Reheating

Fried shrimp are at their best within minutes, so I do not recommend assembling ahead. Keep leftover shrimp, cabbage and rolls separate. I could not find a published storage time for fried shrimp, so my cautious guideline is to eat leftover shrimp within 1 to 2 days. Reheat them on a rack in a hot oven until they reach 74°C (165°F), the figure foodsafety.gov gives for leftovers. A microwave will soften the crust.

Nutrition (Estimate)

These are rough estimates for one sandwich, not lab-tested values. I did not calculate them from a nutrition database, and they vary with the size of the roll, how much oil the coating holds, and the brand of mayonnaise.

Frequently Asked Questions

Can I air-fry or bake the shrimp?

I have not tested those methods with this coating, so I cannot give times. Deep or shallow frying is the documented route here.

Do I need to marinate the shrimp longer?

The banh mi recipe marinates in mayonnaise for 1 to 4 hours. I use a 15-minute buttermilk soak, a shorter adaptation that I have not compared side by side.

Can I make the pickled cabbage ahead?

Yes. Pickle it a day ahead and keep it submerged in the refrigerator. Drain it well before using.

A crispy shrimp sandwich with pickled cabbage rewards a little control: dry the coating’s surface, hold the oil at 175°C (350°F), and drain the cabbage. Those three habits keep the crunch intact from the pan to the last bite.