In the UK, when people ask you "what would you like for tea?"
that has nothing to do with tea.
It means "what would you like to eat for your evening meal?"
You can have potatoes, meat and vegetables, with a glass of mineral water, and still they'll say "we're having tea".
afternoon tea :
Here they serve tea with a variety of sandwiches, scones, maybe chocolates,etc. It is quite an event, usually in an old cosy place, a little posh, with a lace tablecloth, beautiful china, silver teapots, lots of little trays and fringes...delicious !