The part the mechanism supports
Blend it fully, and don't count on it to melt
Blending is doing real mechanical work, turning
visible curds into a fine suspension, not a chemical transformation.
Push it through a blender or food processor until no curd texture
remains; a half-blended sauce reads grainy for a completely
different reason than an aged cheese sauce does.
What to do: blend cottage cheese on its own
before it goes anywhere near the pasta, rather than stirring whole
curds in and hoping the heat finishes the job the way it would with
shredded cheddar.
Where the flavor has to come from
Pair it with a real melting cheese, not instead of one
Cottage cheese supplies water and protein, not the
ageing that gives cheddar its bite or the structure that gives a
blended cheese sauce its pull. See which
cheeses in our corpus melt best if you're choosing what to blend
it with.
What to do: treat cottage cheese as a base that
replaces some milk and some cheese by volume, not as a drop-in
replacement for the cheese itself.
Still true, even without the calcium-bridge risk
Keep the heat gentle anyway
Removing the aged-cheese breaking mechanism doesn't
remove heat risk generally. Any dairy pushed hard enough will weep
water; cottage cheese just fails later and less dramatically than a
wedge of cheddar would.
What to do: fold it in off direct heat, the same
rule every other sauce on this site follows.