1.
Preheat oven to 220 C / Gas mark 7.
2.
Bring a large pot of water to a boil. Add lobster tails, and cook for 5 to 6 minutes. Remove from water, rinse and remove shells. Cut tail meat in half lengthwise. Cut roast lengthwise, to within a thumb's width of the bottom. Fill centre of meat with lobster tails.
3.
In a saucepan, melt butter with garlic, then adding the lemon juice and 250ml of the wine. Drizzle about 1/4 of the butter mixture over the lobster. Tie the tenderloin with kitchen string. Rub the outside of the roast with olive oil and place in a roasting tray. Pour remaining wine in bottom of pan. Sprinkle with cracked black peppercorns.
4.
Bake in preheated oven for 45 minutes to 1 hour. Stir salt into remaining butter mixture, and serve drizzled over slices of roast.
Note:
Beef fillet, or tenderloin, roast is cylindrical in shape and is the most tender cut of beef. Look for a roast that’s firm to the touch and has a clear, red colour.