Cook the salmon: Bring a pot of salted water to a gentle simmer. Add the salmon and poach for 5-7 minutes until it flakes easily. Remove, let cool slightly, then remove the skin and gently break into large flakes. Set aside.
4.6 oz boneless salmon fillet
Prepare the couscous: Place 100g couscous in a heatproof bowl. Pour 150ml of boiling water over it, cover, and let stand for 8-10 minutes. Fluff the grains with a fork.
3.5 oz couscous
Prepare and season the vegetables: Dice the tomatoes, cucumber, and avocado. Toss the avocado with 1 tablespoon of lemon juice to prevent browning. In a bowl, combine the vegetables with olive oil, lemon juice, salt, and pepper. Toss to coat.