“Potato gratin comes in many shapes and sizes,” says chef Ross Lusted. “I like mine thin and crisp on the base with just enough layers to retain that creamy texture. I make it in a cast-iron pan as the base can be caramelised over a flame once removed from the oven.”
Ingredients
Method
Brush a 22cm-square, 6cm-deep baking dish with melted butter.
Using a mandolin, cut potatoes widthways into 1mm-thick slices.
Preheat oven to 160˚C fan-forced. Arrange potato and mushroom slightly overlapping in a single layer to cover the base of pan. Drizzle with a little cream and melted butter; season to taste. Continue to layer potato drizzling with cream and butter as you layer. Place garlic in the centre, brush with butter and drizzle with cream.
Bake gratin until just set, if you cook gratin too quickly it will split the cream. Remove from oven and allow to cool (1 hour). Rest for 10 minutes.
Meanwhile, for black garlic butter, place butter and garlic in a food processor and process until smooth. Transfer to a piece of baking paper and freeze for 10 minutes to set, then cut into small pieces. Heat vegetable stock in a small saucepan over medium heat until simmering. Reduce heat to low and gradually whisk in butter, piece by piece until emulsified. Remove from heat and add juice and season to taste.
When you are ready to serve, preheat oven to 200˚C fan-forced and cook until top is golden (20 minutes). Serve gratin topped with zest, fried sage leaves and remaining black garlic butter.
This recipe also calls for resting, cooling (see method).
Roast garlic in a 180˚C oven wrapped in foil for 30-35 minutes. Cool completely before squeezing from skins; discard skins. Black garlic is available from select delicatessens and supermarkets.
Note