Instructions
Step 1
Season the white fish with salt and pepper, then lightly coat it with all-purpose flour.
Step 2
Heat oil in a frying pan and sear the fish on both sides until golden brown.
Step 3
In a small saucepan, add [A] and bring to a boil over high heat. Reduce to low heat, then add cold butter in 2–3 batches, whisking thoroughly each time to emulsify.
Step 4
Once the sauce has slightly thickened, remove from heat and stir in the lemon juice.
Step 5
Place the cooked fish on a serving plate and pour the sauce over it. Garnish with finely chopped lemon zest, if desired.
Tip
Keep the butter chilled until ready to use. Add it cold and whisk thoroughly each time to create a smooth emulsion.