Bacon makes everything better.
While traditional seafood dressings rely on chilled citrus and olive oil, this preparation introduces warm rendered pork fat and pungent grain mustard for a punchy contrast. Achieving the right temperature in the pan requires a heavy-bottomed cast iron skillet or stainless steel pan that retains heat evenly without scorching the butter and oil blend. When searing dense fish steaks, ensure the pan reaches medium-high heat before adding the protein so the exterior develops a golden crust while the interior remains moist and opaque. Overcooking is the primary pitfall for dense marine species, resulting in a chalky texture and dried-out proteins that resist the binding action of emulsions. Searing for precisely five minutes per side and checking for easy separation with a fork prevents moisture loss.
Substituting neutral canola oil for olive oil in the vinaigrette prevents bitter phenolic compounds from clashing with the sharp red wine vinegar and minced red onion. Whisking the mustard vigorously into the warm bacon fat creates a stable suspension that clings to the dense fish rather than running off the plate.