Simplest Rosti

Ingredients

• 2 large or 3 medium russet potatoes (about 1½ lb.), scrubbed
• 1 small onion, very thinly sliced
• 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more
• Freshly ground black pepper
• ½ cup extra-virgin olive oil, divided
• 1 small garlic clove, finely grated
• 2 Tbsp. fresh lemon juice
• 1 Tbsp. mayonnaise
• 1 tsp. Dijon mustard
• 2 Tbsp. finely grated Parmesan, plus more for serving
• 6 large eggs
• 2 large handfuls arugula, romaine leaves, or Little Gem lettuce leaves

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