Seems like central EU is a very vague term. I meant Slovakia, you probably meant Germany. I don't really low-ball the price, I checked one of the supermarkets current weekly offer, 1kg Chicken breasts (standard quality, respected manufacturer) this week 4,29 E. [0]. You might argue that this is a special offer, but we have similar offer all the time in one of the different supermarkets around.
Your point with beans etc. is valid though. Just the fresh vegetables are very expensive here and feels almost like a luxury item.