Summertown Farmers Market

You'll find this one tucked on Banbury Road in Summertown, where every week locals queue up to pick through whatever's actually in season rather than what's been flown halfway round the world. It's the kind of place where you bump into your neighbour and end up with three types of lettuce you weren't planning to buy, plus a sourdough loaf that'll actually taste like something. The producers know their stuff—they'll chat about growing conditions, suggest recipes, remember you from last week. It's low-key and unpretentious, but that's precisely why it works.