You can also use the stovetop on a gas grill if you prefer.
The steam that evaporates from the saucepan is the liquid leaving the sauce. The more liquid that is removed, the thicker the sauce will become.
Use either a fork or a whisk to mix the flour and water. This amount of thickener works best for 1 cup (250 mL) of BBQ sauce. Adjust the amount of thickener as required by the amount of BBQ sauce that you are using. It isn’t entirely necessary to mix the flour or cornstarch with water first, however this will prevent clumping and will make sure that the thickener is evenly distributed throughout the sauce.
Stir the sauce occasionally as you bring it to a boil.
The sauce will thicken slightly as it cools.
If your BBQ sauce is still too thin, make it thicker by adding small amounts of butter. Organic butter works the best. [11] X Research source If you want to substitute margarine for butter, use a trans fat free type. Using this small amount of butter will only work to make the sauce slightly thicker. The flavor of the sauce may change if you increase the amount of butter.
Use heavy cream that is made from either cow’s milk or goat’s milk. This amount of heavy cream will thicken the sauce slightly. Using more heavy cream will start to change the flavor of the sauce significantly.
Add more coconut cream if the BBQ sauce doesn’t thicken enough. The coconut cream will alter the flavor of the BBQ sauce, so experiment by adding small amounts first to see if you like the flavor. This is an ideal vegan option for thickening BBQ sauce using fats.
