Brown-Butter Orzo With Butternut Squash

thinly sliced, or use onion or leek

small, peeled, seeded and cut into 3/4-inch cubes

finely chopped, or 2 teaspoons chopped rosemary or marjoram, plus more for serving if you like

or table salt, plus more as needed

freshly ground, plus more for serving

plus more for serving

or chicken stock

uncooked

zested and halved

plus more for serving

optional