Method
Cook the barley
Rinse 100 g of pearl barley under cool running water in a fine-mesh sieve. Add 1200 ml of water to a heavy pot and bring to a boil over high heat. Stir in 100 g of pearl barley, reduce to a gentle simmer, and cook uncovered for 30 to 35 minutes, stirring occasionally, until the grains are tender and the liquid looks lightly starchy. Begin checking at 30 minutes; do not drain. While the barley simmers, prepare the onion-mint butter and yogurt base in the next steps.
30:00Soften the onion and bloom the mint
While the barley simmers, finely chop 150 g of yellow onion. Melt 28 g of unsalted butter in a small skillet over medium-low heat. Add 150 g of yellow onion and cook for 6 to 8 minutes, stirring often, until soft and translucent with no deep browning. Stir in 2 g of dried mint just until fragrant, then remove the skillet from the heat.
06:00Temper the yogurt base
While the barley finishes cooking, whisk 735 g of plain whole-milk yogurt, 1 large egg, and 16 g of all-purpose flour in a large heatproof bowl until completely smooth, with no streaks of egg or pockets of flour. Ladle hot barley cooking liquid into the bowl gradually, whisking continuously after each addition, until the mixture is warm and fluid. This slow tempering step keeps the yogurt from separating when it returns to the pot.
Cook the soup gently
Reduce the pot to low heat. Pour the warmed yogurt mixture back into the barley in a thin stream, stirring continuously with a wooden spoon or flexible spatula. Cook for 8 to 12 minutes, keeping the soup below a hard boil and scraping the bottom and corners, until smooth, lightly thickened, and steaming. Use a food thermometer to confirm the soup reaches 71°C/160°F so the egg is fully cooked; begin checking at 8 minutes.
08:00Finish with herbs and serve
Chop 15 g of fresh cilantro. Stir the onion-mint butter into the soup, then add 5 g of kosher salt and 15 g of fresh cilantro. Cook over low heat just until the herbs soften and the seasoning is evenly distributed, without letting the soup boil vigorously. Ladle into warm bowls and serve immediately.
Smart Substitutions
- No pearl barley? Use hulled wheat berries for a chewier, more traditional grain, or short-grain rice for a softer soup. Cook the chosen grain until fully tender before adding the yogurt base.
- No fresh cilantro? Use fresh parsley or dill, keeping the same measured amount.
- Want a sharper yogurt tang? Replace part of the plain whole-milk yogurt with strained yogurt, then loosen the tempered mixture with hot barley cooking liquid as needed.
- No unsalted butter? Use a mild olive oil; the soup will taste lighter and less buttery.
Tips and Variations
- Cook the barley until fully tender before adding the dairy mixture; the yogurt should not stay over heat long enough to soften hard grains.
- Temper gradually and keep whisking so the egg, flour, and yogurt warm at the same pace.
- Once the yogurt is in the pot, sweep the spoon across the bottom and into the corners to prevent sticking and uneven heating.
What Went Wrong?
- The yogurt looks grainy Take the pot off the heat and whisk firmly until smoother. Continue only over low heat and avoid a rolling boil.
- The soup is too thick Whisk in hot water a little at a time until the broth flows easily around the barley.
- The soup is too thin Cook it gently for a few more minutes while stirring continuously; do not raise the heat to a vigorous boil.
- The mint tastes bitter Bloom dried mint only until fragrant and keep the butter and onion from browning deeply.
Nutrition Estimate
- Fiber: 5 g per serving
- Sodium: 600 mg per serving
Nutrition disclaimer:This recipe is provided for general cooking information only. Nutrition values are estimates and may vary by ingredients, brands, preparation methods, and serving sizes. Check ingredient labels and follow appropriate food-safety practices. This content is not medical, dietary, allergy, or professional food-safety advice.
