Pastitsio: lean beef and a lighter béchamel, 197 calories off a slice.

Classic vs lighter, per serving.

The same pastitsio, made two ways from the same library entries and the same 8 servings. The lighter version is the one built on the screens below.

Saturated fat comes from the same USDA entries; the recipe sheet itself shows calories, protein, carbs and fat. Calorie and macro figures are fitness estimates, not medical or dietary advice.

Swap by swap.

Each change in turn, from the classic to the lighter version, and what it does to one serving.

1. Buy 95% lean beef, not 80/20

−74 kcal, +3 g protein, −10 g fat, −3.3 g saturated fat a serving

Same 500 g, 74 kcal and 10 g of fat less a slice, and 3 g more protein.

2. Make the béchamel with 1% milk

−18 kcal, −2 g fat, −1.3 g saturated fat a serving

The same 800 g of 1% milk saves 18 kcal and 1.3 g of saturated fat a slice.

3. Use 40 g of butter, not 100 g

−53 kcal, −6 g fat, −3.8 g saturated fat a serving

The roux needs less than you think. The extra 60 g was 53 kcal and 3.8 g of saturated fat a slice.

4. Top with 60 g of parmesan, not 120 g

−30 kcal, −3 g protein, −2 g fat, −1.2 g saturated fat a serving

A thinner crust of cheese still browns. The other 60 g was 30 kcal a slice.

5. Brown the meat in 10 g of oil, not 30 g

−22 kcal, −3 g fat, −0.3 g saturated fat a serving

Lean beef needs less help in the pan. The extra 20 g was 22 kcal a slice.

Ground meat: read the lean percentage, not the animal.

The number on the pack moves the calories more than the animal does. A 96/4 pack sits between the 95% and 97% entries: choose the closer one, or scan the barcode.

Oil and fat: the type changes the fat, the amount changes the calories.

The three oils below are each 884 kcal per 100 g, and ghee is within a few calories of them. Swapping one for another moves the saturated fat, not the calories; using less is what saves them. Butter is lower per gram only because part of it is water.

The sample data

These are the amounts of the lighter version used on the screens below, with each figure taken from the library entry for that ingredient. They are sample figures for a pot or tray of this size, not a measurement of anyone's kitchen.

Calorie and macro figures are fitness estimates, not medical or dietary advice. Ingredient values are from USDA FoodData Central, which is in the public domain.

Why this recipe

Pastitsio is hard to estimate because it is three layers and a bake. Building it as one recipe gives you a slice with the pasta, the meat and the béchamel in it, and shows which layer the calories actually come from.

What to weigh

Weigh the pasta dry and the meat raw. The tray bakes down as the pasta takes up water and the béchamel sets, so the sample weighs 2,800 g from 2,582 g of ingredients and a slice is 350 g.

Tips while you build it

• Read the lean percentage on the pack and pick the library entry that matches. A 96/4 pack sits between the 95% and 97% entries; choose the closer one, or scan its barcode.
• Whisk the roux into cold milk and stir it as it heats. It thickens smoothly with a modest amount of butter.
• Rest the tray for fifteen minutes before cutting. A slice is about 350 g.

Go further

• Making the traditional version? Save a second recipe with 80/20 beef, whole milk, 100 g of butter and 120 g of cheese.
• Serving it with a salad? Log the salad as its own food.

Each change is a second recipe with its own name, so the first stays as you built it.