Every spring before they sprout and after the ground has thawed, I dig mine up and separate out the big ones for eating and replant the small ones so they aren't overcrowded.
I often cut them up and boil them in acidified water (1 tablespoon of lemon juice per quart of water) for around 45 mins which converts the inulin to simple sugars.
Then I mash / puree them and freeze them in serving sizes for soups.
I like to slice the raw roots up in salads. They work like a sweeter water chestnut. Use them like a condiment until you are sure they don't cause you gastral distress.
I've roasted them whole in hot tallow and salt and they are very tasty - just roast until tender, and serve as a side dish, or open them up and top with all your favourite baked potato toppings
Any tips for how to store them after being harvested? I tried putting them in the crisper drawer in the fridge and the perfectly white flesh developed large areas of dark brown mushiness.