Seared Beef Filet with Horseradish Sauce

INGREDIENTS

1/2 cup

homemade mayo

2 tbsp

freshly grated horseradish

1 tsp

distilled white vinegar

the juice of 1/2 lemon

salt,

filet (I use PRE Brands Grass Fed Filet Mignon)

2 tbsp

olive oil

kosher salt,

black pepper,

sprig of rosemary, leaves removed and chopped finely