I used the apple smoke BBQ sauce from Sprouts market for this tempeh sandwich. If you'd rather make your own, check out my recipe for chipotle BBQ sauce. To keep the sandwich from being too messy if you take it to lunch I recommend wrapping it tightly in parchment paper, cutting it in half (while wrapped), then rewrapping in aluminum. That way you can keep your hands clean while you eat this saucy tempeh sandwich. The recipe is for 4 servings, so keep that in mind if you're just making 1 sandwich at a time. Cook all of the tempeh at once, but prep your other ingredients fresh before putting together each sandwich.