Prep mise en place (5 minutes): Thinly slice the radishes and place in a small bowl of cold water to keep them crisp until assembly. Finely chop the chives and zest the lemon (you'll need 1 tsp zest total). Halve, pit and scoop the avocado into a bowl and set aside. Soft-poaching eggs and quick toasts move fast, so have everything ready to go.

Make the lemon-chive ricotta (3 minutes): In a small bowl, stir together 4 tbsp (≈60 g) whole-milk ricotta, 1 tsp fresh lemon zest, 1 tsp fresh lemon juice, and 1 tbsp of the finely chopped chives. Season lightly with flaky sea salt and freshly ground black pepper. The lemon brightens the ricotta and thins it slightly so it spreads smoothly on the toast; chives add a gentle oniony lift.

Prepare the avocado (2 minutes): Mash the avocado lightly with a fork so you still have some texture; season with a pinch of salt and a few grinds of black pepper. Pressing or mashing the avocado just enough lets it spread evenly and meld with the ricotta without becoming a puree.

Toast the sourdough (3–5 minutes): Heat a large skillet over medium heat and add 1 tbsp butter (or 1 tbsp olive oil if you prefer). When the butter foams, add the sourdough slices and toast until golden and crisp, 1.5–2.5 minutes per side depending on thickness. Toasting in butter develops a nutty, savory crust and adds flavor that contrasts nicely with the creamy toppings. Alternatively, use a toaster and then quickly sear in the pan for a crust.

Bring the poaching liquid to a gentle simmer (2 minutes): Fill a medium saucepan with about 20–25 cm (8–10 cups) of water — you want at least 6–8 cm of depth for the eggs to float. Add 1 tbsp white wine vinegar and a large pinch of salt. Heat until the water reaches a gentle simmer with small bubbles — not a rolling boil — which would break the eggs apart. Vinegar helps the egg whites coagulate quickly into a neat shape.

Create a gentle vortex and poach the eggs (6 minutes total): Stir the water briskly to create a gentle whirlpool in the center (this concentrates the motion so the whites wrap around the yolk). Crack one egg into a small ramekin and gently slide it into the center of the vortex; repeat with remaining eggs, spacing them so they don't touch. Poach for 3–3½ minutes for a slightly runny yolk and fully set whites, or up to 4 minutes for a firmer yolk. Using a ramekin prevents breaking the yolk and allows gentle placement into the water.

Remove and drain the eggs (30–45 seconds): Use a slotted spoon to lift the eggs, briefly blot on a paper towel to remove excess water, and set on a plate. If the whites have stray threads, gently trim with the spoon; do not rinse, as rinsing cools the yolk and removes seasoning.

Assemble the toasts (3–4 minutes): Spread about 2 tbsp of the lemon-chive ricotta on each warm slice of sourdough (this acts as a flavor base and a protective layer so the bread doesn't become soggy). Spoon half of the mashed avocado over the ricotta, then arrange the thin radish slices attractively on top for crispness and peppery bite. Place two warm poached eggs (one per serving portion) on the toasts — or one egg per toast if serving two toasts each — then scatter microgreens (about 15 g per serving), the remaining chopped chives, and a final drizzle of 1 tsp extra-virgin olive oil per serving. Finish with flaky sea salt and freshly ground black pepper.

Final seasoning and serve (30 seconds): Right before serving, squeeze a few drops of lemon juice over each toast to brighten flavors, then add a final pinch of flaky salt to contrast the creamy and fatty components. Serve immediately while the eggs are warm so yolks meld with avocado and ricotta for a luscious mouthfeel.