If you don't grill often (or forgot yours at someone else's cookout), you may not own a basting brush. Luckily, you can easily use a few sturdy lettuce leaves as a substitute.
You probably already have lettuce in your fridge (or near the grill for salad), just grab a sturdy leaf or two and dip the end into your favourite sauce. Then use the leaf to spread the sauce on your meat or vegetables. You'll be able to control how much sauce you use better than if you just poured the sauce directly from the bowl, and you might just like it better than a regular basting brush (which can be a pain to clean).
Try to choose larger leaves so your hand isn't too close to the heat and you can get a good grip. Alternatively, if you have a bundle of fresh herbs at your disposal, you can always use that too. For more tips on what to use as a makeshift basting brush, hit the link below.
3 Ways to Make Improvised Grill Basting Brushes Out of Food [America's Test Kitchen]