Let a friend pick one ingredient. Dinner has to use it.

Dinner tonight gets decided by someone else. Take a friend to the market — or text them from the first stall — and let them pick one ingredient: no hints about what you'd planned, no veto on what comes back. Whatever lands in your hand, dinner gets built around it. If it's something neither of you can name, the person selling it knows exactly what to do with it — ask.