Make the Hollandaise Foam: In a heatproof bowl, whisk together the egg yolks, lemon juice, and water. Place the bowl over a pot of simmering water, whisking constantly until the mixture thickens slightly. Slowly drizzle in the melted butter, continuing to whisk until the sauce is smooth and velvety. Season with salt.
If using a whipping siphon, add lecithin to the hollandaise and transfer the mixture to the siphon. Charge the siphon with gas and shake vigorously to create the foam. Set aside.
Poach the Eggs: Bring a saucepan of water to a simmer and add a splash of vinegar. Crack each egg into a small bowl, then gently slide it into the water. Poach for 3-4 minutes, until the whites are set but the yolk remains soft.
Assemble the Benedict: Place a slice of smoked salmon on each toasted English muffin half. Top with a poached egg and a generous dollop of hollandaise foam. Garnish with fresh dill or chives.
Serve and Enjoy: Serve immediately, with a side of fresh fruit or a light salad for a complete, elegant breakfast.