This is a go-to recipe for whenever you need to impress someone (except a vegetarian, obviously)
SOY-GLAZED FILLET OF BEEF
75ml gluten free soy sauce (I use tamari)
45ml grapeseed oil
45ml dry sherry
2 garlic cloves - finely chopped
1 - 1.5kg fillet of beef, stripped of all fat and silver skin
Season the beef with black pepper.
Combine all marinade ingredients, add the meat and leave to marinate for at least 4 hours, turning it regularly. If you have to refrigerate it, bring it back to room temperature before you cook it.
Heat oven to 220c
Place fillet on a rack in a roasting dish.
Spoon over some of the marinade.
Cook, uncovered and baste from time to time.
Cook 18 - 22 minutes per kilo for rare, and 30 minutes per kilo for medium/rare.