"Too Good To Go", Danish company that helps prevent food waste and save money on food at the same time

I've been using their app for some time now and really like the concept: Basically it allows restaurants, bakeries, supermarkets etc to announce when they have stuff leftover that they'd usually throw away at the end of the day. You can browse those nearby shops in the app and reserve a "surprise bag" for a small amount, usually around a third of the regular price, but it varies. In the pickup timeframe (usally around 30-60min before their closing time) you go there, show that you've reserved the bag in your app, confirm that you've received it and happily walk home with a ton of surprise food for super cheap.

After using it for a while I can especially recommend looking for food stalls at farmers markets as they often have lots of stuff leftover that they don't want to take back home when packing up so they're often super generous. Bakeries are also great, I regularly get a week's supply of bread, buns, pastries and cake for like 3-5€.

EDIT: While it's made in Denmark the app works globally or at least all of EuropeAFAIK, definitely works fine with lots of participating shops in Germany.