Lasagna

• 1 1/2 lblean ground beef · 90/10, or ground turkey thigh
• 1 tbspextra-virgin olive oil
• 1 wholeyellow onion · finely chopped
• 4 clovesgarlic · minced
• 2 tbsptomato paste
• 28 ozcrushed tomatoes · one tin, no added sugar
• 1 tspdried oregano
• 1/2 tspchili flakes
• 1 1/2 tspkosher salt · divided between sauce and ricotta
• 15 ozwhole-milk ricotta
• 1 largeegg · beaten into the ricotta
• 1 cupParmesan · finely grated, divided
• 10 ozfrozen spinach · thawed and squeezed completely dry
• 12 ozwhole-wheat lasagna noodles
• 8 ozlow-moisture mozzarella · grated, for the top only
• 1/4 cupfresh basil · torn, to finish

Method

1. 1

   Reduce the sauce until it is thick, not saucy

   This is the whole recipe. Brown the beef hard, add the onion and garlic, cook the tomato paste for a minute until it darkens, then the crushed tomatoes, and simmer twenty to twenty-five minutes uncovered until a spoon dragged through the pan leaves a channel that holds. Every recipe that produces a soupy lasagna skipped this. A watery sauce has nowhere to go but out of the cut.

2. 2

   Bind the ricotta with an egg

   One beaten egg into fifteen ounces of ricotta, plus half the Parmesan and half a teaspoon of salt. The egg sets during the bake and turns the ricotta layer from a loose spread into something structural that holds its own line in the slice. Without it the ricotta stays a paste that slumps out the side the moment you cut. Whole-milk ricotta, not part-skim, which is grainier and wetter.

3. 3

   Squeeze the spinach until it is genuinely dry

   Ten ounces of thawed frozen spinach holds close to a cup of water and it will all end up in the pan. Wring it in a tea towel until it is a dense green puck about the size of a tennis ball, then break it up with your fingers before stirring it into the ricotta. Fresh spinach needs wilting and squeezing too, and you will need about a pound and a half of it to get there.

4. 4

   Whole-wheat noodles, and do not pre-boil them

   Whole-wheat lasagna sheets bring the dish to five grams of fiber a serving and hold their texture better in a long bake than white ones, which go soft. Layer them dry, unboiled. The sauce and the ricotta carry enough moisture to hydrate them in an hour under foil, and skipping the boil means no torn sheets, no scalded hands, and no pot to wash.

5. 5

   The layer order, and there are only five layers

   Thin scrape of sauce on the bottom so nothing welds to the dish. Then noodles, ricotta and spinach, sauce, and repeat twice more. End on noodles, then the last of the sauce, then the mozzarella and the remaining Parmesan. Mozzarella belongs only on top where it can brown; buried in the middle it turns into a rubbery seam and pushes out water.

6. 6

   Covered for forty minutes, uncovered for twenty

   Oven at 375F. Foil on for the first forty minutes so the noodles steam and hydrate, then off for the last twenty so the top browns and the surface moisture evaporates. If the foil touches the cheese it will lift it off when you pull it, so tent it or oil the underside. You want the edges bubbling and the top mottled brown, not uniformly pale.

7. 7

   Rest it twenty minutes, and this is not negotiable

   Straight out of the oven a lasagna is molten and structurally nothing. Twenty minutes on a rack lets the starch and the egg-set ricotta firm up enough to hold a wall. Thirty is better if you can stand it. Cut it at minute three and it will slide across the plate, which is what has happened every time someone told you lasagna cannot be cut neatly.

8. 8

   Build it ahead, or freeze it before baking

   Assembled and refrigerated it keeps two days raw, and add ten to fifteen minutes to the covered stage if it goes into the oven cold. Frozen unbaked it keeps three months; thaw overnight and bake as written. Baked leftovers keep four days and reheat better in a 350F oven for fifteen minutes than in a microwave, which turns the edges to leather.

9. 9

   What is actually in the 530 calories

   Most of it is the cheese and the beef, and both are load-bearing. The changes that pull it down from a typical restaurant portion are lean ground beef instead of a beef and pork mix, mozzarella limited to the top rather than every layer, no cream or bechamel, and no sugar in the sauce. That gets you to 38g of protein and 5g of fiber a serving without making it taste like a compromise.