Bacalhau com Natas (Portuguese Salt Cod Cream Gratin)
Salt cod poached gently in milk absorbs moisture before it is mixed with half-cooked potatoes and cream and baked until golden. Fully cooked potatoes would collapse in the oven, so they are only partly fried or pan-cooked beforehand. Saltiness varies by product, which means soaking the cod from the day before and tasting just before it goes into the oven. A few minutes of rest after baking lets the cream settle so the layers hold when served.