The woman is making a joke. 'Tasty' means it tastes good. The man says it's tasty looking - that is, the sandwich looks like it tastes good. The woman tells him that the sandwich is tasty tasting - it tastes good.
I go shopping once a week or every other week for house things, food, cleaning products...I make a big shopping and then basic things every day as some bread. For clothes, shoes, books, ... I buy it when I need it, but I am not a fashion victim or something like that, so I go a few times a year. I do not like buying online; but of course if there is a bargain I bought it. I think internet is good for buying electronics, books (children´s stories in English which in Spain are hard to find), some toys... but I prefer to go to the shops and buy it there. I like these short stories, there is much useful English here. Thank you BC
it.s the same answer i will just write it all of your words and you are doing and actions on buy thing i really done every month food & cleaning products but when i need clothes or something like that i will buy it.