This is not your typical potato gratin: The Cheddar and brown-butter pine nuts make it rich but not overly so, as the sumac onions and lemon juice lift the gratin to vibrant heights. Sumac is a tart and astringent spice used heavily in Middle Eastern cooking, adding sharpness to food where needed. These onions are great thrown into pasta and salads, or served with roasted chicken. The gratin can stand as a veggie main with a zesty salad alongside, as an accompaniment to your protein of choice or as part of a larger spread. Get ahead by making the onions and preparing all your ingredients (except the potatoes) well in advance, so they're ready to be assembled together before baking. Once the whole thing goes in the oven, you'll have ample time to get any accompaniments ready. You can serve this warm, but it also sits well to be served at room temperature.
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Author
Yotam Ottolenghi | 2020-03-18
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