Reward Extra Service with an Extra Tip.
Another no-brainer. I generally tip between 20-25% when someone handles my needs well, though I’ll go higher for exceptional service. The reason is that waiting on a Celiac requires far more effort than waiting on a typical patron. If you tip like everyone else, the waiter actually makes less money for the time invested with you than he does elsewhere. That can actually create a disincentive for the waiter to invest in serving you well! But, a good time can remove that disincentive, and a great one can actually incentivize him to go all out for you on future visits.