I made this simple & delicious roast beef recently. there's really no recipe. just cook your beef roast ( I used a small topside roast) to your liking, bake potatoes alongside the meat if you want. serve the beef sliced on a bed of rocket & drizzle with the horseradish and mustard mayonnaise.
Horseradish & Mustard Mayonnaise
small cup mayonnaise (homemade or bought)
1 tablespoon (or to taste) horseradish
2 tablespoons (or to taste) grainy mustard
mix together and use to drizzle over the roast beef!