Preheat oven to 200C. Place the combined potatoes in a roasting pan. Drizzle with oil. Sprinkle with cumin and half the paprika. Season. Toss to combine. Roast for 40 mins or until tender.
Meanwhile, cook the chorizo in a large frying pan over high heat for 1 min each side or until golden brown.
Use a tea towel to squash the potatoes. Roast for a further 20 mins or until crisp.
Add the chorizo and tomatoes to the roasting pan. Roast for a further 20 mins or until tomatoes begin to collapse.
While the potato mixture is roasting, combine sour cream, 2 tsp lemon juice and remaining paprika in a small bowl.
Sprinkle the parsley and lemon zest over the potato mixture. Serve immediately with sour cream mixture.
Recipe courtesy of taste.com.au