Sprinkle the eye fillet with KEEN’S mustard powder, salt, pepper and then rub with olive oil.
Bake for 30 minutes (or cook to your liking) and let rest for 10 minutes.
Whisk the garlic, egg yolk and lemon juice together. Slowly add in oil whilst whisking until it forms a saucy mayonnaise. If too thick add a little warm water.
Slice beef and layer all over a big platter then dollop or drizzle aioli over the beef.
Recipe Tip
Serving suggestion: Serve with sprigs of watercress or rocket.