One of the best things about a CSA (Community Supported Agriculture) box is that each week, home cooks receive a new selection of seasonal produce that inspires creativity and improvisation. Sometimes, though, cooks hit a road block. Sure, you have plenty of ideas for the tomatoes, cukes and lettuce, but what about the kohlrabi or the kale? As the glorious growing season winds down, the chefs of Barbara Lynch’s Stir will present a menu of current offerings from Siena Farms’ CSA along with several favorite ideas for familiar and not-so-familiar veggies. The class will take place at 102 Waltham Street in the South End on Thursday, October 6 beginning at 7 pn, the cost is $145 (which includes an incredible dinner with wine, along with the class), and you can sign up on line at www.stirboston.com, or call 617-423-7847.