These days, everyone's a foodie. So, give your vittles enthusiast groomsman or future father-in-law something to do besides Instagram pics of their lunch. Every guy worth his salt loves pork, so hook him up with some charcuterie or a bacon-centric BBQ sauce. You could go the education route, and up his food IQ for $10 with flashcards.
Charlito's Cocina charcuterie, Cracker Jack'd popcorn, Uncommon Goods slate cheese board, Ad Hoc apple bacon BBQ sauce, Knock Knock foodie flashcards