Such a perfect London thing, Broadway Market. Make your way over here on a Saturday afternoon. The market is a few blocks long and full of vendors selling cool and delicious things. A nice mix of places selling food to make yourself (vegetables, meats, etc.), handcrafted goods, and prepared foods. Stroll the whole thing, then decide what to eat—I doubt you’ll be disappointed by anything!
The shops on the street are worth a browse, too: coffee places, a couple of bookstores, etc. And, once you’ve grabbed your takeaway lunch from one of the vendors, you can enjoy it in beautiful London Fields park, right at one end of the market. Then, you can burn off (some of) the calories with a stroll along the canal.
Full of locals, totally delightful, and perfect on a sunny London Saturday.