Ordered through GrubHub and included a note on my item indicating celiac and the need for my meal to be completely gluten-free. When the order arrived, my meal was in a separate bag and labeled CELIAC and Gluten Allergy. I had been nervous about ordering online, but I feel confident that they saw and honored my restrictions.
Update: Ate there in-person over the weekend. I was given a gluten-free menu. Also the cook came out to ask my preference of corn tortilla (hard or soft) since the items I ordered typically came on flour tortillas.
— Very
— Separate gluten-free menu
— Most/All
— Excellent