Preheat oven to 400˚. Cut broccoli into bite-sized florets and chop the onion into thin strips. Toss both with olive oil, salt, and pepper. Spread onto a sheet tray and roast for 20 to 30 minutes, until broccoli is tender and lightly charring.
Once the broccoli is cooked, tossed together with the lettuce, couscous, almond slivers, and feta.
In a small jar, add the ingredients for the dressing. Shake well and pour 1 to 2 tablespoons over the salad. Toss and serve.