ABOUT THIS RECIPEThe balance of onion and vinegar
This simple side dish gets its character from three main ingredients: green lentils, onion and olive oil. The lentils stay whole and firm enough to hold their shape; the onion softens over low heat and turns golden brown, developing sweet, savory notes. Red wine vinegar adds a fresh, sharp contrast at the end. Bay leaf lends a subtle herbal aroma as the lentils cook, without overpowering them.
Green lentils are a good choice here because they generally hold their shape better than red lentils, which break down more quickly. Cooking time depends on the variety and how long the lentils have been in the pantry, so start checking after about twenty minutes. They’re ready when tender but still have a slight bite. Simmer them gently in plenty of water; a vigorous boil can damage the outside before the center is cooked. Add the vinegar only after cooking: acid in the cooking water can slow the cooking process.
Take your time with the onion. Cook thin rings or half-rings gently in olive oil, stirring regularly so they color evenly without burning. It takes longer than a quick sauté, but gives you a softer, sweeter flavor that pairs beautifully with the earthy lentils. Keep the onion golden brown rather than dark brown; burnt edges can turn bitter. Extra virgin olive oil has a more pronounced flavor, while milder olive oil lets the lentils come through more.
Serve the lentils as a side dish with roasted vegetables, pan-fried or roasted fish, or a simple meal with bread and other small dishes. They’re delicious warm, but can also be eaten at room temperature. That makes them a good fit for a table with several dishes, and means you don’t have to serve them at the last minute. Taste again just before serving: lentils absorb salt and acidity, and a small extra splash of vinegar can brighten the flavor.
Green lentils are the best choice for this texture. If you only have brown lentils, use those and check them in the same way; the cooking time may vary. Don’t use red lentils if you want the lentils to stay whole. Cover any leftovers and refrigerate them within two hours; eat them within three days. Reheat them gently with a small splash of water or olive oil, or serve them cold; add extra vinegar only after tasting again.