This is the kind of dinner to make when a pot of water feels like one task too many. Orzo simmers directly in vegetable broth, absorbing flavor as it softens, while white beans make the pan feel substantial and spinach wilts in at the end. Lemon keeps the creamy-textured pasta bright.
Start with aromatic vegetables
Warm 1 tablespoon olive oil in a large deep skillet over medium heat. Add ½ diced yellow onion and cook for 4 to 5 minutes, stirring now and then, until soft and translucent; add 2 minced garlic cloves and cook for 30 seconds. Keep the heat moderate so the garlic smells fragrant without browning.
Stir in 1 cup dry orzo and let it toast for about a minute, coating the pasta in the oil. Add 3 cups vegetable broth and ½ teaspoon dried oregano, then bring the mixture to a steady simmer. A wide skillet gives the orzo room to cook evenly and makes it easier to stir.
Let the orzo turn silky
Cook uncovered for 8 to 10 minutes, stirring frequently and scraping the bottom of the pan, until the orzo is tender and most of the broth has been absorbed. If the pan looks dry before the pasta is ready, add broth or water a splash at a time. Stirring matters here: it keeps the orzo from sticking and releases starch into the broth.
Fold in one 15-ounce can of drained and rinsed white beans and cook for 2 minutes to warm them through. Add 3 packed cups baby spinach in a few handfuls, stirring until just wilted. If you want a looser, more spoonable texture, stir in another splash of warm broth.
Finish fresh and serve warm
Turn off the heat and stir in the zest of 1 lemon, 1 tablespoon lemon juice, and 2 tablespoons chopped parsley. Taste before adding salt, since vegetable broth can vary; black pepper is welcome too. The lemon should come through clearly without making the pan taste sour.
Serve straight from the skillet while the orzo is glossy and loose. It thickens as it stands, so keep a little extra broth nearby for reheating leftovers. A handful of fresh spinach folded in at the end gives this simple pantry dinner its green, just-cooked finish.