Karen, Yes, it can... Just read the news below, and can't think of T-giving w/o it in our home.
I purchase the big bag of mixed veggies at costco, its a layered bag of cauliflower and broccoli and I add a bag of carrots.
We make this every year, I pull it all together on Wed, and let go to room temp on Thurs prior to heating up. It is a keeper in our home. The horseradish is a fun unexpected flavor. It truly is a keeper, as was Charlie. ((I am so sad!))