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1
In a large bowl, whisk together buckwheat flour, all-purpose flour, and salt. Add egg, milk, and water and whisk until thoroughly combined and slightly aerated. (Small bubbles should initially form on surface when batter is left to stand.)
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2
In a nonstick skillet or well-seasoned carbon steel crepe pan, melt about 1/2 tablespoon (7g) butter over high heat until browned and starting to smoke. Add just enough batter to thinly coat bottom of pan (about 80ml; 1/3 cup), swirling to evenly cover. Return to heat and let cook until bottom is beginning to brown well and top looks dry, 30 seconds to 1 minute. (To make sure, check the bottom for browning by gently lifting an edge of the crepe.) Reduce heat at any point to prevent burning.
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3
Start by spreading a small handful of grated Gruyere cheese around the center of the crepe while it's still in the pan, on the heat. Lay a slice of ham on top of cheese and slide a fried egg on top of ham. Using a
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4
(being extra careful not to scratch pan if nonstick), fold sides of crepe in to form a rectangular shape with egg yolk exposed. Continue to cook until bottom is well browned and crisp, about 30 seconds. Serve, then repeat with remaining crepe batter, butter, and fillings.
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5
Carefully free crepe from pan with a thin metal spatula (being careful not to scratch pan if nonstick), then flip and cook other side for about 10 seconds. Transfer to a plate. Continue with remaining crepe batter and butter. Keep cooked crepes stacked and covered with a clean kitchen towel while cooking remaining crepes. Crepes can be held for about 1 hour before using, then quickly reheated in a skillet.
