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Step 1
Preparation Place a rack in upper third of oven; preheat to 425°F. Toss potatoes in a large bowl with 1/4 cup oil (using a bowl will help get the slices well coated, which means they’ll get super crisp in the oven). Season generously with salt.
Step 2
Transfer potatoes to a rimmed baking sheet and spread out into an even layer (it’s fine to have them piled on top of each other; just keep them even). Roast, undisturbed, until browned and very crisp (top and bottom), 40–50 minutes. Let cool 5 minutes.
Step 3
Heat remaining 2 Tbsp. oil in a large nonstick skillet over medium-high. Crack eggs into pan and fry, spooning oil over whites, until set, about 3 minutes.
Step 4
Divide potatoes among plates and top each with an egg, some smoked fish, and crème fraîche. Spoon roe over and scatter some dill and onion on top.