The Oak Park Farmers' Market has been open since May 18, but, as always, the market started slow. The first few weeks offered little locally grown produce beyond lettuce, asparagus and rhubarb. Don't get me wrong: I can do a lot with asparagus and rhubarb. Like grilled asparagus, asparagus pesto, rhubarb jam, and rhubarb-ginger buckle, just to name ...