Node doesn't know it belongs to menu item

I have two content types: shop and restaurant
Both content types have two taxonomy terms:
*) shops has shoes and food
*) restaurant has greek and italian

now I have a view for every term:
*) a list of shoe shops (drupal path: shop/shoes)
*) a list of food shops (drupal path: shop/food)
*) a list of greek restaurants (drupal path: restaurant/greek)
*) a list of italian restaurants (drupal path: restaurant/italian)

every view gets a tab menu so it looks like this:

shop | restaurant
shoes | food

or like this

shop | restaurant
greek | italian

depending on what main menu item is selected.

now I get the list of nodes I want.

so far so good.

but when I visit the nodes themselves they don't know they're part of this group (e.g. greek restaurants) anymore and I lose the menu.

I don't want to give every single node an entry in the tab menu...

What to do? Anyone?