Crêpes
2 large eggs
3/4 cup all-purpose flour
1/2 cup whole milk
1/2 teaspoon granulated sugar
1/8 teaspoon kosher salt
1/3 cup cold water
1 tablespoon canola oil
1 tablespoon unsalted butter, melted, plus more for skillet
Orange-Butter Sauce
1/2 cup unsalted butter (4 ounces), softened
1/3 cup plus 2 tablespoons granulated sugar, divided
1/2 tablespoon finely grated orange zest
1/3 cup fresh orange juice (from about 2 medium oranges)
3 tablespoons (1 1/2 ounces) orange liqueur (such as Grand Marnier or Cointreau)
1 tablespoon (1/2 ounce) Cognac
Gather the ingredients.
Make the crêpes:
Whisk together eggs, flour, milk, sugar, and salt in a medium bowl until smooth; batter will be thick.
Whisk in water, oil, and melted butter until well combined.
Heat a 10-inch crêpe pan or nonstick skillet over medium-high and brush with butter.
Add 3 tablespoons batter and quickly tilt skillet to evenly distribute batter.
Cook until the edges of the crêpe curl up and start to brown, about 45 seconds.
Flip the crêpe using a long spatula; cook until a few brown spots appear on the bottom, 10 to 15 seconds.
Transfer the crêpe to a baking sheet.
Repeat process with remaining batter to make about nine more crêpes, wiping skillet clean and lightly buttering skillet as necessary between crêpes.
Make the orange-butter sauce:
Process butter, 1/3 cup sugar, and orange zest in a food processor.
With processor running, gradually add orange juice until incorporated.
Spoon butter mixture into a 12-inch flameproof skillet; cook over medium, stirring occasionally, until bubbling, 2 to 3 minutes.
Continue to cook, stirring occasionally, until mixture is syrupy, about 3 minutes.
Reduce heat to low.
Working with 1 crêpe at a time, dip both sides of crêpe in sauce using 2 forks or silicone spatulas; fold into fourths with prettiest side facing outward.
Lift and let excess sauce drip off; transfer folded crêpe to a baking sheet.
Repeat with remaining crêpes, scraping down sides of skillet as needed.
Transfer folded crêpes back to skillet, overlapping slightly as needed to fit all 10 crêpes in skillet; scrape any excess sauce on baking sheet back into skillet.
Sprinkle crêpes with remaining 2 tablespoons sugar.
Increase heat to medium.
Add Grand Marnier and Cognac; carefully ignite sauce using a long-handled lighter.
Carefully spoon flaming sauce over crêpes using a long-handled, heatproof spoon until flames subside, about 30 seconds.
Transfer crêpes to a platter; spoon any extra sauce over top.
Serve immediately.
Make ahead:
Crêpes can be prepared through step 2, wrapped well, and stored in refrigerator up to 2 days.
Bring crêpes to room temperature before proceeding with step 3.