Prep mise en place: slice the bread (if not pre-sliced), thinly slice the tomatoes and mozzarella, pick and lightly tear the basil leaves, halve and scoop the avocado into a bowl, and have your eggs on hand in a small cup each (this makes gentle egg transfer easier). Good mise en place shortens cook time and prevents overcooking the eggs.

Make the avocado spread: mash the avocado with a fork until mostly smooth but still slightly chunky; fold in 1 tsp lemon juice and 1/4 tsp sea salt. The lemon juice brightens flavor and slows oxidation; leaving a touch of texture makes the toast more interesting than a completely puréed spread.

Toast the bread: heat a large skillet or grill pan over medium-high heat. Brush both sides of each slice with a thin film of olive oil (about 1/2 tbsp oil per serving total; for two servings use 1 tbsp). Toast 1–2 minutes per side until golden and crisp. Brushing with oil encourages Maillard browning for a deeper, nutty flavor and ensures the toast stands up to moist toppings.

Optional garlic rub: after toasting, rub the hot toast briefly with the cut side of the garlic clove. This quickly imparts gentle garlic aroma without overpowering the delicate Caprese flavors—do this only if you like a hint of garlic.

Warm the mozzarella slightly (optional): arrange mozzarella slices on the hot toast, cover with a lid for 30–60 seconds so residual heat softens the cheese. Warming the mozzarella makes it creamier and helps it meld with tomato and avocado — but don’t melt it into oblivion; you want fresh-mozzarella creaminess, not rubbery cheese.

Poach the eggs: fill a wide, shallow saucepan with 3–4 cups (about 1 liter) water and bring to a gentle simmer — small bubbles at the bottom, not a rolling boil. Add 1 tbsp white wine vinegar (this helps egg whites coagulate faster). Stir the water to create a gentle whirlpool, then slide an egg from its cup into the center. The whirlpool helps the white wrap neatly around the yolk, giving a tidy poached egg. Poach large eggs 3 minutes for a runny yolk, 3 1/2–4 minutes for slightly set yolks. Remove with a slotted spoon and drain on a paper towel.

Assemble the toasts: Spread a generous layer of the mashed avocado on each slice of toast (this creates a barrier so tomatoes don’t sog the bread). Arrange tomato slices in an overlapping layer, then top with the warmed mozzarella slices. Placing avocado down first keeps the toast structural and adds a creamy counterpoint to the tomatoes' acidity.

Top with the egg and finish: Gently place a poached egg on each toast. Scatter torn basil leaves over the egg and tomato, drizzle each toast with 1 tsp balsamic reduction, crack fresh black pepper and finish with a pinch of flaky sea salt. The balsamic reduction gives a sweet-tangy contrast that makes the dish sing; flaky salt provides the final crunchy lift.

Serve immediately: Serve the toasts hot so you get the contrast of crisp bread, cool mozzarella, creamy avocado and the warm, runny yolk that acts like a silky sauce. Encourage diners to cut into the egg so the yolk envelops the toppings.