- 4 teaspoons finely chopped rosemary
- 4 teaspoons distilled white vinegar
- 2 cups mayonnaise
- 1 garlic clove, pressed
- Romaine lettuce leaves
- 2 pounds thinly sliced roast beef
- 1 red onion, thinly sliced (optional)
- Place chopped rosemary and vinegar in medium bowl. Let stand 15 minutes. Whisk in mayonnaise and garlic. Season rosemary mayonnaise to taste with salt and pepper. (Can be made 2 days ahead. Cover and keep refrigerated.)
- Line large platter with romaine leaves. Arrange roast beef atop lettuce. Sprinkle with onion slices, if desired. Serve roast beef and rosemary mayonnaise separately.