Make the batter: In a large mixing bowl, whisk the 6 eggs until frothy (this incorporates air for lift). Add the cold water and 1/2 teaspoon of the salt and whisk to combine. Sift in the 1 1/2 cups (180 g) of all-purpose flour in two additions, whisking between additions until you have a smooth, lump-free batter. Why: whisking eggs first creates a uniform base so the flour incorporates smoothly; sifting and adding flour gradually prevents lumps and overworking the gluten.

Rest the batter: Cover the bowl and let it rest at room temperature for 20 minutes. Why: resting hydrates the flour (autolyse) and lets the gluten relax, producing tender, more flexible pancakes with a silkier interior.

Caramelize the onions: While the batter rests, heat a wide sauté pan over medium-low heat. Add 1 tablespoon olive oil and 1 tablespoon butter. When the butter foams, add the thinly sliced onions and a pinch of salt. Cook slowly, stirring every 3–4 minutes, lowering the heat if they begin to brown too quickly. After about 12–18 minutes the onions will turn deep golden and sweet. Add the minced garlic and 1/4 teaspoon salt in the last 90 seconds to bloom the garlic without burning it. Why: slow, gentle heat breaks down onion cellulose and converts starches to sugar, producing deep caramelization and complex sweetness that balances the savory pancakes.

Make the herbed brown butter finish: In a small saucepan, melt the remaining 3 tablespoons (42 g) butter over medium heat. Swirl frequently; after about 3–4 minutes the butter will foam and then develop brown specks with a nutty aroma—this is browned butter. Remove from heat and stir in the dried thyme and smoked paprika. Why: browning concentrates butter flavor and creates nutty, caramel notes that lift the entire dish; adding herbs off-heat prevents them from burning while allowing oils to infuse.

Season the batter: Taste the rested batter and stir in the remaining 1/2 teaspoon salt (if needed) and 1/2 teaspoon freshly ground black pepper. The batter should be pourable and slightly thinner than pancake batter—if too thick, whisk in 1–2 tablespoons water. Why: final seasoning ensures the pancakes are flavorful on their own; slightly thin batter gives crepe-like tenderness with enough body from eggs to hold a fold.

Cook the pancakes: Heat a nonstick or well-seasoned skillet over medium (a drop of water should dance on the surface). Brush with a thinnish film of butter. Pour 1/3 cup (about 80 ml) batter into the pan, immediately tilting/rotating the pan to spread into a 6–7 inch round. Cook until edges look set and small bubbles form and pop across the surface, 1 1/2–2 minutes. Flip with a thin spatula and cook another 45–60 seconds until golden. Transfer to a warm plate and keep loosely tented while you cook the rest, wiping the pan clean and lightly buttering between batches. Why: moderate heat cooks the egg-enriched batter through without burning the exterior; spreading the batter thin yields tender, slightly lacy edges and quick cooking.

Assemble and finish: Stack 2–3 pancakes per serving on warm plates, spoon a generous layer of caramelized onions between layers, and drizzle 1 tablespoon of the herbed brown butter over the top. Finish with a pinch of smoked paprika and the optional chopped fresh herbs for color. Why: stacking keeps pancakes warm and the layered onions add concentrated savory pockets; the hot brown butter melds flavors and glosses the pancakes for an elevated presentation.

Serve immediately: Serve the stacks hot with extra melted butter on the side and freshly cracked black pepper. Why: these pancakes are best when warm—the butter is aromatic and the texture is at its peak; cooled pancakes become a bit denser.