What is your favorite side dish for roast beef?

I'm making a medium rare roast beef for Xmas dinner. I'm already planning on mashed potatoes. I'm also thinking about roasted asparagus and roasted wild mushrooms. I need some creative advice! What's your favorite side with beef? Recipes would be helpful, but even just ideas are appreciated; I'm... show more I'm making a medium rare roast beef for Xmas dinner. I'm already planning on mashed potatoes. I'm also thinking about roasted asparagus and roasted wild mushrooms. I need some creative advice! What's your favorite side with beef? Recipes would be helpful, but even just ideas are appreciated; I'm pretty good about winging it! Thanks!
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