I'm trying a new recipe tonight for barbecued baby back ribs. The recipe (from a grilling-related cookbook) calls for soaking the ribs in vinegar for at least four hours. Then you drain and dry them and marinate them in a rub (brown sugar, smoked paprika, garlic, etc.) for two hours. After that, you grill them and finish them off with barbecue sauce for the last twenty minutes. Any idea what the vinegar soak does? I've never come across that step. (I'm never happy with my ribs, so I keep trying new recipes!)Thanks.