Peel the potatoes and thickly slice into a bowl of cold water.
In heavy saucepan set over moderate heat, cook the grated onion in olive oil until melting, 3 to 4 minutes. Add the tomato, ginger, paprika, cumin, and garlic. Cook, stirring, for 2 more minutes.
Drain the potatoes and add to the pan with the thinly sliced onion, the bay leaf, and the fresh l