Context: Salim and Tara are talking about the foods available.
तारा - ये क्या हैं ?सलीम - ये सब्ज़ियाँ हैं।
तारा - वह कौन-सी सब्ज़ी है?
सलीम - वह करेला है।
तारा - वह कैसा है? क्या वह स्वादिष्ट है?
सलीम - वह बहुत कड़वा है, लेकिन बहुत लज़ीज़ है।
तारा - और ये क्या हैं ?
सलीम - ये नमकीन है, आपको कौन-सा नमकीन चाहिए?
तारा - मुझे पकोड़ा चाहिए।
Tara - What are these?
Salim - They are vegetables.
Tara - Which vegetable is this?
Salim - That is karela.
Tara - How is it? Is it tasty?
Salim - It is very bitter, but it is very tasty.
Tara - And what are these?
Salim - They are savouries, which savoury would you like?
Tara - I want pakora.
To say something is liked you say it is ‘liked to somebody’.
It is similar to the construction we have already learned to express wanting something.
If what is liked is plural the verb changes to plural, as in है to हैं
To say something is not liked put नहीं after पसंद but before the final है. Sometimes people also leave out the final है when saying they don't like things in statements like this and this makes them less emphatic.
कौन-सा means which? It behaves like काला. It is used when you are asking about which out of a limited number of possibilities. In English we might use what? in some contexts such as colours, days of the week, etc. But in Hindi कौन-सा is used when there is set of choices, such as questions about colours, days of the week and which dish you like from a menu.
क्यों means why? and क्योंकि means because and is used like this:
Karela, bitter gourd
tasty (from Sanskrit)
tasty (from Urdu)
for what purpose?
hot from chilli (also तीता, चटपटा)