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THE COOKING NOTEBOOK · Vegetarian

Stuffed onions: tender shells and barley filling

Tender onion shells cradle pearled barley, walnuts and their own sautéed centers over a fresh tomato sauce.

THE COMPLETE FREE RECIPE

Barley and walnut stuffed onions

Tender onion shells cradle pearled barley, walnuts and their own sautéed centers over a fresh tomato sauce.

2 hr 45 minEstimated total time4 portions, each with 2 onion halves and one quarter of all filling and tomato sauceYield
Tender onion shells cradle pearled barley, walnuts and their own sautéed centers over a fresh tomato sauce.
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Ingredients

Volumes are approximate. For baking, use a scale; Metric keeps the specified gram weights.

Instructions

  1. Combine barley and about 12 ½ oz (350 g) water in a small covered saucepan. Simmer gently 30-45 minutes until tender, checking the package; add plain water if needed. Uncover briefly to absorb or evaporate loose water rather than draining. Meanwhile halve the onions lengthwise through the root. Simmer halves in plain water 12-15 minutes until outer layers bend; lift out and cool 10 minutes. Retain every edible center as you gently scoop out the middle, leaving two or three outer layers for each of eight shells.
  2. Chop all removed onion centers. Heat about 1 ½ tbsp (20 g) olive oil in a skillet and cook chopped centers 12-15 minutes until soft and reduced. Add garlic and thyme for 1 minute. Stir in all cooked barley, walnuts, parsley, 2 g salt and pepper. Heat the oven to 375°F (190°C).
  3. Mix tomatoes and all their juice with remaining 10 g oil and 2 g salt in a 9-by-13-inch (23-by-33-cm) baking dish. Nestle in onion shells and divide filling among them; place any excess filling between the shells so none is discarded. Cover tightly with foil and bake 35 minutes. Uncover and bake 15-20 minutes more, until the shells are completely tender and the filling reaches 165°F (74°C).
  4. Rest 10 minutes. Serve two halves per portion with one quarter of the tomato sauce and any surrounding filling. Refrigerate leftovers in shallow containers within 2 hours, use within 3-4 days and reheat to 165°F (74°C).

Estimated nutrition

Per serving · 1 of 4
Calories
339 kcal
Protein
7.7 g
Total carbohydrate
41.6 g
Total fat
18 g
Total sugars
11.7 g

Calculated from the listed ingredients and yield. Brands, draining, cooking and portioning can change the result. Not a laboratory analysis.

Calculation notes & sources

ESTIMATED per serving. Brand, crop, preparation, draining, pan residue and substitutions change actual nutrition. Not laboratory analysis. Each ingredient retains its primary food description and state. All listed ingredient masses are counted; cooking moisture changes do not change the stated portion count. No generic nutrient-retention factor is invented. Calories are kcal; protein, total carbohydrate, fat and total sugar are grams. Total carbohydrate includes fiber and is not net carbohydrate. Fiber and sodium are not displayed. Equal portions or explicitly counted items define the stated recipe yield. US/Metric display changes do not change these canonical inputs. Primary-source supplements are retained per ingredient where USDA lacks a field; missing values are never silently changed to zero. Divide all eight stuffed halves, any extra filling and the complete tomato base equally by four. Contains barley gluten and walnuts. Vegan and dairy-free criteria require plain ingredients without animal additions; these tags are not allergen-safety claims.

View the ingredient calculations · Source 1

Times and nutrition are estimates. Check product labels, quantities and safe cooking. US measures are approximate; exact Metric amounts remain available.

By Recipe Pinboard · October 29, 2026 · 4 min read

The onion performs two jobs in this recipe. Its outer layers hold the filling, while its chopped centers add sweetness and moisture to the barley. Nothing edible from the four peeled onions needs to be discarded. Walnuts provide texture, and fresh tomatoes form the baking base. This is a patient vegetable main: the 165-minute allowance includes cooking the grain, softening and hollowing the shells, baking and resting. Start the barley first and use its simmering time to prepare the onions.

The recipe at a glance

Barley and walnut stuffed onions makes 4 servings, with 2 hr 45 min estimated total time. View the standalone recipe page.

Choose four evenly sized onions

Buy onions close enough in size that eight lengthwise halves will fit the same baking dish. The recipe calls for 800 g after papery skins are removed, rather than four onions of any weight. Halving through the root gives the layers a connection while they soften. Do not cut away a large plug from the base before scooping, because it can leave an open hole. Simmer the halves until their outer layers bend, then cool them before handling. A slippery hot onion is difficult to hollow safely and easy to tear.

Save the centers for the filling

Leave two or three layers around each shell, removing the middle gently with a small spoon. Keep all edible pieces, including loose layers that separate during handling. Chop these pieces together and cook them in the measured oil until soft and reduced. Their moisture needs time to evaporate; rushing this stage leaves a watery filling beneath a browned top. If one shell tears, overlap its layers in the dish and support it against a neighboring half. It can still hold filling without an elaborate repair or a discarded portion.

Cook the barley before stuffing

Use dry pearled barley, not a cup of already cooked grain. The listed water starts the absorption cooking, but individual packages can require different simmering times. Check tenderness before assembly: the grains should be chewy without a hard center. If water remains when they are tender, uncover and let it evaporate instead of pouring it away. Stir all the cooked barley into the reduced onion centers with walnuts and parsley. This keeps the calculation tied to the complete dry-grain input and avoids guessing a drained cooked weight.

Build a moist base and protect the shells

Spread the chopped tomatoes and their juices beneath the onions. The covered baking stage keeps moisture around the shells while they finish softening. Divide the filling among the eight cavities, putting any surplus between them; cavity sizes vary, and forcing every spoonful into a tiny shell can split it. Seal the foil around the dish rather than loosely balancing it on top. When you uncover for the final stage, look for gentle bubbling around the onions. The filling should reach 165°F and the shell should yield easily to a small knife.

Rest before portioning

Let the dish stand for ten minutes so the filling is less likely to scatter when lifted. A broad spoon works better than tongs, which squeeze the delicate layers. Serve two halves with one quarter of the tomato base and any extra filling from the dish. The estimate includes all walnuts and oil, not merely what sits inside each shell. Barley contains gluten, and walnuts remain a listed allergen even though the recipe is vegan. Refrigerate leftovers promptly in shallow containers, keeping the sauce with the onions so reheated portions remain moist.

Common questions

Why are the shells still firm?

Large onions or thick outer layers may need longer softening. Re-cover the baking dish and continue until a knife enters easily; browning alone does not show tenderness. Check that some moist tomato sauce remains around the shells rather than letting the base dry out.

Can I replace barley with another grain?

A different grain changes cooking water, cooking time and nutrient values. This formulation uses the entire measured batch of pearled barley. Keep that basis for the published estimate rather than exchanging an equal volume of cooked rice or couscous.

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