Get pressure cooker instructions in the recipe footnotes
Heat a 4.5-quart soup pot over medium-high heat. Add the OLIVE OIL and heat until shimmering.
Add the ITALIAN SAUSAGE and cook until browned, breaking it apart as it cooks. Transfer with a slotted spoon to a plate and set aside.
Drain excess grease, leaving about a teaspoon for sauteing. Add the ONION, CELERY, and GARLIC, and sauté until tender and fragrant.
Return the SAUSAGE to the pot. Add the ORZO, TOMATOES (with their juice), CHICKEN BROTH, ITALIAN SEASONING, SALT, and PEPPER.
Bring to a boil, then reduce to medium-low. Simmer for 10–15 minutes, stirring occasionally, until the ORSO PASTA is tender.
Adjust the consistency with more WATER or BROTH if needed.
Serve warm with recommended toppings.
To store: Cool completely. Refrigerate in an airtight container for up to 5 days, or freeze for up to 3 months.
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Notes
Pasta cooking time: When substituting orzo with other pasta, adjust the cooking time as needed to cook the pasta to your liking.
Soup consistency: To thicken the soup, simmer to reduce excess liquid. Add small amounts of water or broth as it simmers to thin it.
Stir frequently: Stir as needed during the simmering stage to keep the orzo from sticking to itself or the pot.
Reheating tip: Orzo absorbs liquid as it cools, so you'll likely need to add broth or water when reheating to bring back the perfect consistency.
Pressure cooker option: Use the Sauté setting to brown SAUSAGE and vegetables. Add remaining ingredients, seal, and pressure cook on HIGH for 0 (zero) minutes—or 1 minute for larger pasta. Yes, you heard that right: zero or one minute only! Then allow a 10-minute natural release. After that, quick release any remaining pressure. Stir, taste, and serve.