How a trip to London showed me that great pastry is part technique and part food cost math.
I first tasted a proper Pastel de Nata in 2022 at Café de Nata in London, Camden Town. I’d had versions before — including forzen and stale stale ones from grocery store bakery sections, decent ones from Portuguese restaurants — but nothing prepared me for what came out of that counter.
The shell shattered when I bit into it. Not crumbled. Shattered. Hundreds of paper-thin layers giving way to a custard so silky it barely held its shape. The top had those signature dark leopard spots from an oven hot enough to caramelize sugar in minutes.
As a chef, I couldn’t stop thinking about the technique. As a food cost consultant, I couldn’t stop thinking about the potential contribution margins.
The Thumb Technique
If you’ve ever watched someone make traditional Pastéis de Nata in Lisbon, you’ve seen the thumb work. Bakers take a small disc of laminated dough and press it into those iconic fluted tins using nothing but their thumbs — spinning, pressing, stretching the dough up the sides in one fluid motion.
It’s mesmerizing. It’s also the result of thousands of pastries, over and over again – a lot of practice.
The magic happens because the dough goes into the tin on its side. Those laminated layers aren’t horizontal like a croissant — they’re vertical, spiraling up the walls of the tin. When it bakes, each layer puffs independently, creating that impossibly flaky, shatteringly crisp shell.
Most home recipes tell you to roll out puff pastry and cut circles. Those work. They taste fine. But they’ll never give you that same architecture.
The Adapted Technique (No Thumb Calluses Required)
Here’s how I get 80% of the way there without the apprenticeship:
- Take store-bought puff pastry – or your own, bravo. (cold, not room temperature)
- Roll it slightly thinner than it comes
- Roll it up tightly into a cylinder — like a Swiss roll
- Slice the cylinder into rounds
- Press each round into your tin
You’re essentially creating the same spiral structure, using your thumb and a bit of water to help spread the pastry on to the walls of the tin. The layers still run vertically. The pastry still shatters.
Is it as good as Café de Nata’s? No. Is it better than 95% of the Pastéis de Nata served outside Portugal? Absolutely.
The Recipe: Portuguese Custard Tarts
Yield: 36 tarts
For the Shells
- 3 sheets ready-made puff pastry (approx. 250–300g each), thawed but cold
- Flour for dusting
For the Custard
- 270g (1⅓ cups) granulated sugar
- 240ml (1 cup) water
- 1 cinnamon stick
- Peel of 1 lemon (large strips, no pith)
- 480ml whole milk
- 30–40g (3–4 tbsp) all-purpose flour
- 10–12 large egg yolks
- 1 tsp vanilla extract (optional)
- Pinch of salt
For Finishing
- Ground cinnamon (optional)
- Powdered sugar (optional)
Method
1. Make the Sugar Syrup
Combine sugar, water, cinnamon stick, and lemon peel in a saucepan. Bring to a boil, then simmer gently until the sugar dissolves completely and the syrup is clear (about 5 minutes). Remove from heat and let cool while you prep the rest.
This syrup does two things: it sweetens the custard and helps create that slightly brûléed top.
2. Prepare the Custard Base
Whisk together milk, flour, and salt in another saucepan until smooth. Cook over medium heat, stirring constantly, until the mixture thickens but is still pourable — not fully set.
Remove from heat and cool for 10 minutes. Whisk in the egg yolks until fully incorporated. Slowly stir in the cooled syrup (fish out the cinnamon stick and lemon peel first). Add vanilla if using.
Strain through a fine sieve. This isn’t optional if you want silky custard.
3. Form the Pastry Shells
Lightly flour your work surface. Lay one sheet of puff pastry flat, fold it in half (short side to short side), and press gently with a rolling pin. Starting from the short end, roll it tightly into a log. Repeat with remaining sheets.
Slice each log into 12 equal pieces (36 total). Flatten each piece into a circle large enough to line your muffin tin wells. Press into each cup, forming walls with slightly higher edges than the custard will fill.
4. Fill and Bake
Preheat your oven as hot as it goes — 250–290°C (480–550°F) is ideal. This is non-negotiable. A timid oven makes timid tarts.
Fill each shell about ¾ full with custard. Bake 10–15 minutes until the custard surface shows dark caramel spots and the pastry is deep golden.
Cool 5 minutes in the tin, then transfer to wire racks.
5. Serve
Warm or at room temperature, with a light dusting of cinnamon and/or powdered sugar if you like. Best eaten the same day — the pastry starts losing its crispness after a few hours.
Now Let’s Talk Money
Here’s where most food blogs stop. Recipe done, pretty photo, see you next week.
But you’re reading Food Cost Chef, so let’s do what we actually do: run the numbers.
I costed this recipe using the FoodCostChef Calculator, pulling current ingredient prices from my local suppliers:
| Metric | Value |
|---|---|
| Total Batch Cost | $15.77 |
| Yield | 36 tarts |
| Cost Per Tart | $0.44 |
Forty-four cents per tart.
Now look at what these sell for:
- Café de Nata (London): £2.50 (~$3.15 USD)
- Specialty bakeries (North America): $3.50–$4.50
- Coffee shops with pastry cases: $3.00–$4.00
Let’s say you’re conservative and price at $2.75 (the lower end of the market):
| Metric | Value |
|---|---|
| Menu Price | $2.75 |
| Food Cost | $0.44 |
| Gross Profit Per Tart | $2.31 |
| Food Cost Percentage | 15.9% |
A 15.9% food cost on a pastry item. That’s exceptional.
Even at a coffee-shop-friendly $2.25 price point:
| Metric | Value |
|---|---|
| Menu Price | $2.25 |
| Food Cost | $0.44 |
| Gross Profit Per Tart | $1.81 |
| Food Cost Percentage | 19.5% |
Still under 20%. Still printing money.
The Real Math
Let’s say you sell 50 of these a day at $2.75:
- Daily Revenue: $137.50
- Daily Food Cost: $22.00
- Daily Gross Profit: $115.50
Over a month (26 operating days): $3,003 gross profit from one pastry item.
That’s not counting the coffee they buy with it.
Why This Matters
Every chef knows Pastéis de Nata are delicious. Not every chef knows they’re also a margin machine.
The ingredient list is cheap: eggs, sugar, milk, flour, store-bought puff pastry. The technique is learnable in an afternoon. The shelf appeal is instant — people see those caramelized tops and they want one.
If you’re running a café, bakery, or restaurant with a pastry case, these deserve a spot. The skill-to-profit ratio is absurd.
And if you’re not tracking your recipe costs this way? You’re guessing. Maybe you’re guessing right. But in a business where 2-3% on food cost can be the difference between profit and loss, guessing isn’t a strategy.
It’s only good food if the math works.
Want to cost your own recipes like this? The FoodCostChef Calculator is the Excel-based tool I built after 40 years in professional kitchens. One-time purchase. No subscriptions. Yours forever.
Or grab the free Menu Matrix template to start engineering your menu for profit.
