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Finely diced vegetables ready for a picadillo
Blue Zone Recipe · Nicoyan

Nicoyan Chayote & Black Bean
Picadillo

Not a festival dish. This is the pan of finely diced vegetables that appears on Nicoyan tables most weeks — chayote, black beans, sweetcorn, coriander, and a tortilla to scoop it with.

Prep
20 min
Cook
25 min
Total
45 min
Makes
4
Diet
Vegan · GF

Picadillo in Costa Rica means something finely chopped and cooked down in a pan — not the meat-and-raisin dish the word describes elsewhere. In Nicoya it is usually vegetable-led: chayote most often, sometimes green papaya or potato, bulked with beans and eaten folded into a tortilla.

It is the least glamorous thing on this site and probably the most representative. Blue Zone eating is not a parade of signature dishes — it is the same cheap, plant-heavy pan of something, most days, for decades.

The Longevity Science
The boring pairing that does the work
There is nothing exotic here, and that is the finding. Beans plus a whole grain plus vegetables, eaten habitually, is the pattern that shows up in every one of the five regions. On the legume side the 2026 dose-response meta-analysis of 12 prospective studies found high versus low legume intake associated with a relative risk of 0.84 (95% CI 0.77–0.93) for hypertension, with benefit still increasing to around 170 g a day. A 2026 scoping review of pulses and cancer outcomes maps a similar direction across the literature. Chayote itself has no meaningful research behind it and this page will not pretend otherwise — it is a cheap, mild, high-water squash whose job is to carry the beans and get eaten often.
~170 g
Daily legume intake to which the hypertension benefit kept increasing
One pan
The realistic test of a longevity food: can you make it on a Tuesday

The Ingredients

How to Make It

1
Dice small, and evenly

The whole character of a picadillo is in the cut — 5mm, consistent, so everything cooks at the same rate and a spoonful carries all of it at once. Chayote is slippery once peeled; keep your knuckles back.

2
Sweat the base

Olive oil over medium, then the onion and pepper with a good pinch of salt for 8 minutes until soft and sweet. Add the garlic, coriander stalks, cumin, oregano and paprika and cook 1 minute more until fragrant.

3
Steam the chayote

Add the chayote and 100ml water, cover, and cook 12–15 minutes, stirring once or twice. It releases a lot of its own liquid — you want it tender with a slight bite, not collapsed.

4
Add beans and corn last

Fold in the black beans and sweetcorn and cook uncovered 5 minutes, letting the remaining liquid cook off. Beans added early break up; added here they stay whole.

5
Finish bright

Off the heat, stir through most of the coriander leaves and a good squeeze of lime, then taste and correct the salt — it will need more than you expect. Serve with warm tortillas and the rest of the coriander on top.