01 -
Take your pan off the stove. Mix in the shredded parmesan, lemon peel, a bit more salt, and that black pepper you measured out. Toss really well. If things look a bit dry, splash in some pasta water you saved earlier. Pour some into bowls and serve right away.
02 -
Slide in your spaghetti and fresh spinach once the pan juice bubbles up. Swirl it around so the greens soften but don't get soggy, and everything slicks up nicely.
03 -
Set a big skillet on medium flame. Drop in the butter and let it melt out. Stir in your garlic plus red pepper flakes. Keep it moving for about a minute—don't let the garlic brown. As soon as you can smell it, you're good.
04 -
Grab a big pot and fill it with salted water. Get it boiling hard, then toss in your spaghetti. Cook till it's got a bite to it—read the package, but around 9 to 10 minutes is about right. Ladle out around 240 ml of that pasta water and put it aside. Drain the rest and skip rinsing.