I’d like to say “ It was consolidated?/deeper? my interest [on cooking( I originally have this interest)] after I tasted the very palatable cuisine which made by my grandma.

Maybe I didn’t describe the question clearly. I’d like to say this phrase by “comparative”.

DeepeN, strengthen, grow, and develop are all options.

Hi Alice, I would say “grow or develop passion for smth” and “maintain/keep interest”

Both can be correct however the first one should be deepen my passion/interest but I think the first one sounds better