If you wander through downtown Knoxville on a Wednesday or Saturday morning from May to November, you will likely chance upon the Market Square Farmers’ Market, and what a happy accident it will be. Your eye will feast upon a kaleidoscope of homegrown vegetables. Heirloom tomatoes bejewel the boxes and crates, their variegated skins like the cloud-cover of exotic planets. Peppers of all sizes and colors spill out from baskets, drawing the brave and foolhardy with mythic names like Carolina Reaper and Trinidad Scorpion. Greens of every shade festoon the tables.