What was little Miss Muffet eating while she sat on her tuffet?

Little Miss Muffet sat on a tuffet,
Eating her curds and wiegh,

Along came a spider who sat down beside her,
And frightened Miss Muffet away!

Curds are a dairy product obtained by coagulating milk in a process called curdling. Whey is the liquid remaining after milk has been curdled and strained. The whole mess is similar to cottage cheese.