Every Thursday and Saturday is a market. They sell eggs, fruits, veggies, flowers, cheese, meat, fish, cakes and a lot more. It's a really nice atmosphere and lovely people. Nice coffeeshops around
There is a market around Kollwitzplatz on Saturdays (morning and early afternoon) where you can buy fresh fruit, veggies, bread, cheese etc, get a handmade leather bag or ring or just have a glass of wine.