In a medium saucepan, bring the vegetable stock liquid, salt, butter and olive oil to the boil.
Stir through the couscous. Remove from the heat and cover tightly with a lid. Allow to sit for 5 minutes before fluffing up with a fork.
Pour the couscous into a large bowl.
Place the chopped red capsicum, zucchini, red onion, and sweet potato onto a large flat baking tray. Drizzle with olive oil and season with salt and pepper.
Bake in a 200 degrees celsius (fan-forced) oven for 20 minutes or until the vegetables are tender.
Add the vegetables, sundried tomato strips, crumbled feta and rocket to the bowl of couscous and mix gently to combine.
Place all of the dressing ingredients into a small jar. Cover with a lid and shake well until combined.
Pour the dressing over the salad and toss gently to combine.