Why some cheeses stretch
Cheese is a net of casein protein holding fat and water. Warmth loosens the net so it flows. Young cheeses like mozzarella have long, moist strands that stretch. Aged ones have lost water and broken casein into short pieces, so they crumble or turn greasy.
Heat and acid change how cheese melts
Acid-set cheeses like paneer hold their shape instead of melting. In a sauce, too much heat clumps the casein tight and squeezes out fat, leaving grease and strings. Melt cheese gently, off the boil, a handful at a time.
Test yourself
Questions from the interactive lesson, with the answer and the why.
Why does mozzarella stretch on pizza?
Its long, moist casein strands stay intact. Intact casein strands pull into long stretches when warm.
True or false: Aged Parmesan melts into a smooth, stretchy blanket like mozzarella.
False. Aged cheese has lost water and shortened its casein, so it crumbles and releases fat.
What went wrong? You boil a cheddar sauce hard to melt the cheese faster. It turns grainy with an oily slick.
Hard heat tightened casein and pushed out fat. Boiling clumps casein and pushes fat out, so the sauce splits.
Fill the blank: A hard aged cheese melts poorly because it has lost much of its ___.
A hard aged cheese melts poorly because it has lost much of its water. Less water and shorter casein mean it crumbles instead of stretching.
Which cheese gives the best stretchy pizza pull?
Low-moisture mozzarella. Intact casein strands melt and stretch.
