Rinse the rice in a medium size bowl with cold water. Stir the rice with your fingers to release the milky starch. Repeat until the water is clear. Drain the water and set aside.: You will notice the water turn cloudy at first and then clear as you swish the grains, a sign that surface starch is leaving the rice. Rinsing prevents gummy texture and encourages each grain to remain separate when cooked. Use your fingers to gently stir, and continue until the water is mostly clear, then drain thoroughly. A common mistake is rushing this step, which can lead to clumping after cooking. If the rice still seems cloudy, repeat the rinse until clearer, because that clarity is the visual cue the rice is ready.
Turn the pressure cooker to the saute mode to heat the insert. Add the olive oil and saute with the diced onion stirring often, sauteing until the onion is tender. Stir in the garlic.: As the insert warms, you will hear a soft sizzle when the olive oil goes in, and the oil will shimmer slightly, showing it is hot enough. Add the diced onion and stir often so it softens evenly, becoming translucent and fragrant. When you add the minced garlic you should smell a bright, savory hit almost immediately; cook the garlic briefly to avoid bitterness. The purpose of sautéing is to build depth in the finished rice, and skipping or undercooking the aromatics yields a flatter outcome. If the aromatics start to brown too quickly, lower the heat or remove the insert briefly to cool.
Add the broth to the electric pressure cooker and deglaze the bottom with a wooden spoon to remove any cooked on pieces. Stir in the salt, pepper and cumin, then cancel the saute function.: Pour in the stock and scrape the bottom so any browned bits lift off, which prevents the Instant Pot from triggering a burn warning later. You should see those caramelized bits dissolve into the liquid, creating a deeper smelling broth. After deglazing, stir in the salt , black pepper and ground cumin , then cancel the saute function. If you skip deglazing, you risk a stuck layer that can scorch during pressure cooking. Make sure no visible residue remains on the bottom before proceeding.
Stir the rinsed rice into the broth. Over the rice, dot with tomato paste. Do not stir.: The rice will sink and settle in the liquid, and you can gently level it with a spoon so it forms an even bed. Over the rice, dot with tomato paste . Do not stir.: At this point you should still see distinct grains resting above the broth, and the tomato paste should sit in little glossy mounds on the rice surface. Leaving the paste unmixed prevents it from scorching on the bottom and ensures it melts into the rice as pressure builds. Avoid stirring in the tomato paste now because that is often what causes a burn notice on electric pressure cookers. If you accidentally stir, try to ensure no paste is pressed against the heated base.
Cover the electric pressure cooker and program to manual or pressure cook for 7 minutes, then natural release for 10 minutes.: As pressure builds you will hear gentle clicks and a low hum, and the sealed environment will steam the rice thoroughly. The heat and steam transform the grains, making them tender yet intact. The stated cook time was chosen to balance doneness and texture for long grain white rice. A common misstep is shortening the cook time to hurry dinner, which produces undercooked centers; trust the timing and allow the cooker to complete its cycle.
Open the pressure cooker and stir to mix and fluff the rice.: After the cooking cycle ends, leave the pot undisturbed for the natural release period so the steam redistributes gently and the rice finishes carrying residual heat. You may notice a soft hiss as pressure slowly drops, and patience here helps prevent a sudden collapse that can make the grains compact. If you force a quick release too early you may end up with unevenly cooked rice or a wetter texture. Use the natural release window as the cue to plate other components.
Place in a serving bowl and top with chopped cilantro and a fresh diced tomato if desired.: When you lift the lid the scent of tomato and cumin will be prominent, and the surface will look steamed and slightly glossy. Use a fork or silicone spatula to gently fluff, separating the grains so the texture is airy. Fluffing helps release trapped steam and gives the rice a light appearance. Common mistakes include stirring too vigorously, which can break grains into a gluey mass, so be gentle and lift more than you stir.
Place in a serving bowl and top with chopped cilantro and a fresh diced tomato if desired: The final touches add fresh contrast, both visually and in taste. The cilantro smells bright and herbaceous, while the diced tomato contributes a juicy pop that balances the savory base. Add these just before serving to retain color and texture. If you add herbs too early they will wilt and lose vibrancy, which diminishes the intended fresh finish.