If I had a photo, I would most certainly use it. That is... unless the photo I have sucks. For now, you'll just have to picture a big heaping helping of
Melt the butter in a heavy-bottomed saucepan on medium heat. Whisk in the flour and cook, stirring constantly, until the paste cooks and bubbles a bit, but don’t let it brown - about 2 minutes.
Add milk in small amounts, continuing to stir as the sauce thickens. Add pinch of salt and pepper to taste, lower the heat, and cook, stirring for 2 to 3 minutes until smooth. Remove from the heat - stir in parsley and horseradish
Drizzle each seabass fillet with olive oil and season with salt & pepper on both sides
Place seasoned fish fillets in a hot pan face down and sear for about 3 minutes on each side, until opaque
Plate fish and top with 2-3 tablespoons of the horseradish sauce