Do like Burger King does with catsup. Have them ask for it. PITA but it will bring this walk-away food cost under control. They know a bottle (8 oz) of sauce should cost 'em $5-6 bucks (or whatever the cost is). There are always folks that will abuse self-service. Just don't give them the chance. Having to ask for sauce will make this problem go away. Figure what should be given and give that - make the beg and always offer a bottle!!!
If anyone else asks, tell 'em why. You're in business and they are not your best friend!!
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker