What’s the best thing about your favourite food?
Is it the yumminess, deliciousness, delectableness of it?
If you’re running out of ways to describe the scrumptiousness of the dishes you enjoy the most, you may like to try using delicity. This noun refers to the deliciousness or delightfulness of something. It was first coined in the 1500s (OED), and these days its use seems to be limited to the names of food shops – after all deli is in the word.