Too hot for barbecue? Hardly. With the Texas heat pushing triple digits, we headed north toward Lake Texoma on a recent Saturday for the latest chapter in our Barbecue Chronicles. Over about 11 hours, we traveled 200 miles and ate at five joints. Our tour included planned stops and some chance finds, one of which turned out to be the highlight of the day. Learning from our earlier expedition to Tarrant County, when we overstuffed ourselves, we took a midday break at Cedar Mills Marina. We found some nice shade where we relaxed, watched sailboats, played horseshoes and rejuvenated our…