Prep the vegetables and salmon: Halve the cherry tomatoes and set aside; measure the arugula and have the smoked salmon ready at room temperature for 5–10 minutes. WHY: Halving tomatoes lets their juices mingle with the avocado without making the toast soggy, and bringing salmon slightly toward room temperature develops its aroma and makes it silkier on the toast.

Toast the bread until deeply golden and crisp (about 2–4 minutes under a broiler or 3–5 minutes in a toaster depending on your bread). WHY: A well-toasted slice creates structure — the crunchy surface resists becoming soggy from the avocado and provides a satisfying textural contrast to the soft toppings.

While the bread toasts, halve the avocado, remove the pit, and scoop the flesh into a bowl. Add the lemon juice and a generous pinch of salt. Mash gently with a fork to a spreadable but still slightly chunky texture. WHY: Mashing (not puréeing) gives a pleasant mouthfeel and small chunks that cling to the toast. Lemon juice brightens the avocado and slows oxidation so it stays green while you assemble.

Dress the halved cherry tomatoes very lightly with a tiny pinch of salt and one small drop of olive oil (reserve remaining oil). Toss the arugula with a whisper of the remaining olive oil and a very light pinch of salt. WHY: Lightly dressing the greens and tomatoes enhances their natural flavors without making them watery; a minimal oil coating helps the arugula cling to the avocado and salmon layers.

Assemble: Drizzle each toast with about ½ tsp olive oil (this helps seal the toast surface). Spread about half of the mashed avocado onto each pair of slices (roughly 70 g avocado per serving total across two slices). Season the avocado with a small pinch of salt and a little cracked pepper if desired. WHY: Oil on the toast increases flavor and creates a subtle barrier to slow sogginess; seasoning the avocado ensures every bite is flavorful.

Layer the dressed arugula over the avocado, then drape 50 g smoked salmon over each plate of toast (fold the salmon for height and silkiness). Add the halved cherry tomatoes on top or to the side for refreshing bursts. WHY: Arranging ingredients in layers — greens, then salmon — keeps delicate salmon from directly contacting the warm toast and lets the peppery arugula and acidic tomatoes temper the richness of the avocado and salmon.

Finish with a final squeeze of lemon over each toast, a scatter of sesame seeds (or a crack of black pepper), and a tiny finishing drizzle of olive oil if desired. Taste and adjust salt. WHY: The final acid lift from lemon and the nutty crunch of sesame (or heat from cracked pepper) provide the last bright notes that make the dish sing.

Serve immediately on warmed plates. WHY: Serve right away so the toast remains crunchy and the contrast of textures — crisp bread, creamy avocado, silky salmon — is at its best.