recently I was listening to That Vegan Couple's podcast about the HappyCow application, and they said that Warsaw is on of the top cities in the world with the concentration of vegan restaurants! so Poland is lucky now))

Yes, freezing is a good idea, this summer I froze tomatoes and paprika, but some veggies are not suitable for that, like cucumbers, eggplants, zuckini, cauliflower.