• Preheat the oven to 400°F. Line 2 large baking sheets with parchment paper.
• Wash the potatoes well and dry them. Cut them into ½-inch chunks.
• Place the cut potatoes in a large bowl. Add the olive oil, salt, smoked paprika, cumin and black pepper. Toss well until all potatoes are well coated with the oil and spices.
• Transfer the potatoes to the lined baking sheet, making sure to also pour on any oil and liquid remaining at the bottom of the bowl. Bake for 30 minutes or until the potatoes are tender.

Harissa Sauce

• Combine all ingredients except for the water, in a medium bowl. Whisk in the water, one tablespoon at a time, until well incorporated (the sauce should have the consistency of a thin ranch dressing).
• To serve, pour the sauce over warm potatoes or serve the sauce on the side.