For the cumin potatoes: * 5-6 medium to large Cypriot potatoes, peeled and halved * 1 large Onion, thinly sliced into rings * 1½ tsp ground cumin * 1½ tsp ground cinnamon * 2 tbsp extra virgin olive oil * sea salt, and freshly ground pepper * 400g canned tomatoes, drained * 100ml water