Yehuday, it depends where.
Northern Poland, Lithuania, yes, agreed- a lot of root vegetables, maybe apples and pears in summer.
But further South- and I’m not talking coast of the Mediterranean south, I’m talking about countries commonly considered part of Eastern Europe- there were Jews living in places that had a lot of fresh produce in the summer. Asparagus. Cauliflower. A great variety of berries, including raspberries, were used to make jams and preserves. I’ve often wondered how that worked. Dried fruits like raisins and dried figs were also quite common, by the way.