In addition to what's already been mentioned (although, I admit I didn't watch the Iron Chef videos), if you're looking or savory, pumpkin works in a lot of places where you might use potatoes:

• pumpkin gnocchi : use roasted mashed pumpkin in place of the potato; look for recipes online
• roasted pumpkin : cube, toss with oil and salt (and maybe herbs & vinegar), roast alone or with other vegetables (eg, carrots, onion, garlic).
• pumpkin waffles (or pancakes) : again, look online, there might be vegan versions.
• pumpkin croquettes (fritters) : ditto, but I don't know how they'd bind without eggs

And of course:

• pumpkin bread (or muffins) : lots of recipes online

... but just about any recipe that calls for acorn squash (unless it's used as a serving dish), or sweet potato might give you ideas.