INGREDIENTS
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1 large red onion
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2 tbsp. olive oil
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2 medium red potatoes (about 12 oz.), cut into 1/2-in. pieces
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kosher salt
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black pepper
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1/4 c. fresh flat-leaf parsley, chopped
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8 large eggs
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1 c. whole milk
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4 oz. extra-sharp Cheddar
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1 tbsp. red wine vinegar
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2 tsp. Dijon mustard
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1/2 seedless cucumber, thinly sliced into half moons
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1 large head romaine or other green lettuce