I also am insulin resistant and I'm always on the lookout for good low carb recipes. Especially sauces. One BBQ sauce that I have tried and really like is mustard based sauce, rather than tomato based. Here is the recipe:
Carolina Style Low Carb BBQ Sauce
1 cup yellow mustard
1/2 cup Splenda or Swerve
3/4 cup cider vinegar
2 tablespoons chili powder
2 teaspoons pepper
1/4 teaspoon cayenne pepper
1/2 teaspoon soy sauce
2 tablespoons butter
1 tablespoon liquid smoke
In a saucepan over medium heat, stir together mustard, sweetener, vinegar, chili powder, and all pepper. Simmer for 30 minutes.
Stir in soy sauce, butter, and liquid smoke; simmer for 10 more minutes. Cool completely and refrigerate overnight.