The ingredients for Long John Silver’s Fish Batter in the recipe you shared are:
- 1 1/2 cups all-purpose flour
- 2 tbsp cornstarch
- 1 tsp baking powder
- 1 tsp baking soda
- 1 tsp salt
The introduction to the recipe reads:
Long John Silver’s Fish Batter is the signature coating used on the chain’s deep-fried fish fillets — light, crispy, golden, and with a characteristic crunch that many people try to replicate at home. There isn’t an official publicly disclosed “secret recipe” from the company, but several copycat versions that aim to mimic it are widely shared based on tested methods and common ingredients.