Grilled Buttermilk Chicken

I created this recipe years ago after one of our farmers market customers, a chef, shared the idea of marinating chicken in buttermilk. The chicken is easy to prepare and always turns out moist and delicious! I bruise the thyme sprigs by twisting them before adding them to the buttermilk mixture; this tends to release the oils in the leaves and flavor the chicken better. —Sue Gronholz, Beaver Dam, Wisconsin