Combine the bulgur and boiling water in a heatproof bowl. Set aside and let soak for 30 minutes (if you are using coarser bulgur, soak for 45 minutes). Drain in a fine strainer, gently pressing the bulgur with a spoon without crushing to remove all excess water.
Heat the oil in a heavy saucepan over medium-high heat. Add the onion and sauté, stirring, un