Turn a 6-quart Instant Pot or similar pressure cooker appliance to saute and melt the butter.*** (See Notes): The moment you begin sautéing you should notice a warm, nutty aroma as the butter melts and the pot surface heats. This initial heat is crucial because it creates the fond when the beef hits the pot later, which translates to deep flavor in the finished gravy. If the butter smokes it is too hot, so reduce the heat or remove the insert briefly to cool. A common mistake is rushing this step, which yields little fond and a less flavorful sauce.
Add the onions and saute for about 3 minutes; stir frequently.: As the onion softens, it will start to smell sweet and fragrant, and you may see tiny translucent edges. Sautéing until the edges are soft helps the onion break down into the gravy, adding body and depth. Stirring frequently prevents scorching and ensures even color development. Avoid undercooking the onion , which can leave harsh raw bits in the sauce.
Add the garlic and saute for about 1 minute, or until fragrant; stir constantly.: The aroma will change quickly to a garlicky perfume, signaling it is ready. Stirring constantly avoids burning the garlic , which turns bitter fast. This brief cook time is enough for the garlic to release oils and flavor while remaining bright. If you smell a sharp, acrid scent, you likely overheated the garlic and should start over from fresh aromatics.
Add the beef and brown all sides of the meat, stirring and flipping as necessary to sear it properly.: When you add the cubed beef , you should hear a sizzle as the exterior browns and caramelizes. Browning creates Maillard flavors that are essential for a savory gravy. Work in batches if the pot is crowded, as overcrowding causes steaming instead of searing. A typical error is to dump all the beef at once, which prevents proper browning and results in a paler, less flavorful sauce.
Add all remaining ingredients (minus the water and corn starch), cover with the lid and seal it, and set the Instant Pot to High and cook for 30 minutes.: Once the aromatics and browned beef are in, pouring in the beef broth will deglaze the pot and lift up those concentrated browned bits, releasing an intense flavor wave. As the pressure builds, the flavors intensify and the connective tissues in the beef break down, producing tender meat. Make sure the lid is sealed correctly; an improper seal can prevent reaching full pressure and leave the beef tough.
When the time has finished, do a quick release, using caution since the steam that escapes can burn you.: The hiss and burst of steam is expected, and it releases built up pressure rapidly so you can finish the dish. Stand back and use a long-handled utensil to move the valve to the venting position. Do not place your face or hands over the steam path. A typical mistake is to rush this step and get burned by the hot steam or splattering liquid.
Turn the Instant Pot back onto saute mode; set aside.: Reactivating sauté will allow you to thicken and finish the gravy while keeping the meat warm. You will notice gentle bubbling and a deepened aroma as the sauce reduces slightly. Leaving the pot off can cool the sauce and make the corn starch less effective when added. Be mindful of vigorous boiling which can evaporate too much liquid quickly.
In a small bowl, add the cold water, corn starch, and stir until dissolved.: Mixing the corn starch into cold water forms a smooth slurry, which prevents lumps when you add it to hot liquid. The slurry should look uniformly opaque with no streaks. If you add undissolved corn starch directly to hot gravy it will clump, so take the time to whisk it smooth in cold liquid first.
Slowly and while whisking, add your corn starch slurry to the beef and gravy inside the pot. Continue whisking until it thickens; which shouldn't take more than a couple minutes.: As you stream in the slurry while whisking, the gravy will transition from a loose broth to a glossy, velvety sauce that clings to the beef . The visual cue is a noticeable sheen and thicker coating on the back of your spoon. Continue whisking for a minute or two to achieve uniform texture. If you add the slurry too quickly you risk uneven thickening or lumps.
Turn off the machine and serve the beef tips and gravy*** (See Notes) over mashed potatoes, rice, or noodles. Extra beef tips and gravy will keep airtight in the fridge for up to 5 days or in the freezer for up to 4 months.: After the sauce reaches desired thickness, turning off the pot preserves texture and prevents over reduction. The aroma will be rich and inviting, with tender beef pieces bathed in a glossy gravy. Serve over mashed potatoes, rice, or noodles while hot. A common pitfall is letting the sauce cool too much before serving, which can make it appear thinner; reheat gently if needed.