Slow cooking at 200 for 4 hours may be the easiest, but here a few other ways I've done it.

Fermentation with lactic acid bacteria can reduce the inulin content as well. This can be accomplished through lacto-fermentation, where the sunchokes are submerged in a brine (saltwater solution) for an extended period, allowing natural bacteria to break down the inulin.

Utilizing a pressure cooker can also help break down inulin. Cooking sunchokes in a pressure cooker for about 20-30 minutes may render them more digestible.

Cooking sunchokes with ingredients known to aid digestion, such as ginger, may alleviate some of the symptoms