Classic Eggs Florentine with silky blender Hollandaise, garlicky sautéed spinach, and perfectly poached eggs on toasted English muffins—ready in 30 minutes.
Melt the butter until fully liquid and hot but not browned; keep warm.
Make the Hollandaise: In a blender, add egg yolks and lemon juice with a pinch of salt. Blend for 10 seconds. With the motor running, slowly stream in the hot melted butter until thick and silky. Blend in the cayenne. Keep warm in a small thermos or a bowl set over warm (not hot) water.
Sauté the spinach: Heat olive oil in a skillet over medium heat. Add garlic and cook 30 seconds. Add spinach and 0.25 teaspoon salt; cook, tossing, until wilted and glossy, 2 to 3 minutes. Finish with black pepper. Keep warm.
Poach the eggs: Bring 2 to 3 inches of water to a gentle simmer in a saucepan and add the vinegar. Crack each egg into a small cup. Swirl the water and slide the eggs in one at a time. Poach until whites are set and yolks are still runny, about 3 minutes. Remove with a slotted spoon and drain on paper towels; lightly season with a pinch of salt.
Toast the English muffins until golden.
Assemble: Place muffin halves on plates, top with sautéed spinach, then a poached egg on each half. Spoon Hollandaise over the top and serve immediately.
Notes
Keep Hollandaise warm, not hot, to avoid splitting. For a lighter version, use half the butter and whisk in 2 tablespoons warm water at the end. Add a pinch of nutmeg to the spinach for a classic bistro touch.