Place broccoli florets in a steamer basket. Set aside.: You should feel the slight weight of the florets as you arrange them; they should occupy the basket loosely to allow steam circulation. The scent is fresh and vegetal, almost grassy. I avoid crowding the basket because steam needs to move freely to cook evenly. A common misstep is cramming too many florets in, which leads to unevenly cooked pieces.
Add enough water to a pot to come up to about 1 inch. Bring it to a boil over medium heat.: Listen for the first gentle roar as the water heats, then for steady bubbling. The water should not touch the basket; the idea is steam transfer not boiling. You'll see wisps of vapor rising, and the kitchen will smell faintly of mineral warm water. If the water is too high it will splash into the basket, making the broccoli wet and reducing the bright texture.
When the water is boiling, carefully place the steamer basket with broccoli into the pot. Cover with lid.: As you set the basket in, you may hear a soft hiss of steam. Secure the lid to trap the steam and watch the heat condense on the inside of the lid in little droplets. The trapped steam cooks gently and evenly. Avoid lifting the lid frequently, because each peek releases heat and lengthens cooking time.
Steam for 5 minutes. Check the broccoli if it's soft. If you want it softer, cook for 1 more minute. It is helpful to set up a timer (ex. on your microwave).: After about five minutes you should smell a sweet vegetal aroma and see the florets turn vibrant green. Test a medium sized piece by piercing with a fork; it should offer slight resistance but not be crunchy. If you prefer softer texture, allow one additional minute and test again. A common mistake is leaving it too long which yields a limp, dull colored vegetable.
Once done, remove basket with broccoli.: Use tongs or oven mitts to lift the basket, feeling the warmth radiate off the metal. Let any excess condensation drip back into the pot, then transfer the broccoli to a bowl or platter to avoid residual heat continuing to cook it. If you leave it in the basket above the pot, it will keep steaming and may overcook.
Serve right away.: The aroma is at its peak when the broccoli is freshly steamed, and the surface glistens slightly. I like to season immediately so the salt adheres while the florets are still warm. Serving later often results in a loss of that vibrant color and slightly crisp texture, so prompt plating preserves the best experience.