Toast and chop the almonds. Place the almonds in a small dry skillet over medium heat and toast, tossing frequently, until fragrant and a shade darker (about 3–4 minutes). Toasting releases the almond's oils and deepens flavor — it turns a simple crunch into a toasty, aromatic accent. Transfer to a plate to stop cooking and chop roughly once cooled.

Prepare the melon. If using cantaloupe, cut away rind and either ball with a melon baller or slice into 1/2-inch wedges. If you slice, aim for uniform pieces so the salad eats evenly. Melon provides juicy sweetness that contrasts the salty prosciutto — handling it gently preserves texture and prevents too much juice from diluting the dressing.

Dress the arugula lightly. In a small bowl whisk 1 tablespoon extra-virgin olive oil with 1 tablespoon fresh lemon juice and a pinch of flaky sea salt and several generous grinds of black pepper. Taste and adjust: the dressing should be bright and slightly tangy to lift both the melon and the prosciutto. Toss the arugula in the dressing just before plating — dressing early will wilt the leaves; a quick toss keeps them crisp and peppery.

Arrange the base. Lay the dressed arugula in a loose mound on a chilled serving plate; the loose arrangement keeps the salad airy and restaurant-elegant. Scatter half the melon pieces across the arugula so sweetness is distributed.

Drape the prosciutto. Tear or fold the prosciutto slices into rustic ribbons and drape them over the arugula and melon. Tearing preserves the delicate texture; folding creates volume and visual appeal. The prosciutto's salt and fat will mingle with the melon juices for classic Italian contrast.

Finish with almonds and seasoning. Sprinkle the chopped toasted almonds across the salad for crunch and nutty warmth. Add a final scatter of flaky salt and a few extra turns of black pepper to taste. If you like, finish with an extra tiny drizzle (1/2 tsp) of high-quality extra-virgin olive oil for sheen.

Serve immediately. This salad is best eaten right away while arugula is crisp and almonds stay crunchy. Leftovers will get watery as melon releases juice and prosciutto will lose its tender texture.