We’d form them into starchy mountains, create a well in the middle, and make a lake of gravy. While this version of mashed potatoes would be right at home on your Thanksgiving table, it’s too good to only eat once every year. And it doesn’t even need gravy. You can make it with russets, but I like to use yellow spuds.
A softball-sized celery root weighs about 3 lbs, so get the same amount of spuds. If you’ve got more than 6 people to feed, double that. Trim and peel the celery root and potatoes, then cut them into roughly equal sized chunks.
Steam or boil the potatoes and celery root together until easily pierced with a fork, about 15 minutes
If boiled, drain well, then put the pot with the vegetables on medium low heat for a few minutes, shaking the pot often, until any remaining moisture is gone.
Use a potato masher or fork to coarsely mash the vegetables.
Stir in a lot more extra virgin olive oil than you think you should, at least a quarter cup, preferably more. Season with salt and black pepper, taste and add more if needed.