Heat a barbecue grill or chargrill on medium-high. Combine the butter and garlic in a small bowl. Season. Brush the baguette slices evenly with half the butter mixture. Brush the beef with the remaining butter mixture. Season.
Cook beef for 3 mins each side for medium-rare or until cooked to your liking. Transfer to a plate. Cover with foil and set aside for 5 mins to rest.
Meanwhile, cook the baguette slices on the grill for 1-2 mins each side or until lightly toasted
Divide tomato, rocket, avocado and bocconcini among serving plates. Thinly slice beef. Arrange over the salad. Whisk the oil and vinegar in a bowl. Season. Drizzle over the salad. Serve with the baguette slices.
