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Line a 20 x 20cm baking tin with baking paper.
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In a large pot, combine the water, milk and garlic and bring to the boil.
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Put the butter, ricotta, parmesan and salt in a small bowl and set aside
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Add the polenta to the milk mixture, stirring constantly, until thickened (about 2-3 minutes) and it pulls away from the side of the pan.
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Remove from the heat and stir in the butter, ricotta, parmesan and salt until the butter has melted through and the ricotta is evenly distributed through the polenta. It doesn’t need to be fully mixed though - a few little white ricotta bits are good!
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Press the mixture evenly into the lined baking tin. Sprinkle with the rosemary and give them a good grind of salt, pressing it gently into the surface with your hands.
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Cover with clingfilm and place in the fridge until set (30min to an hour) or overnight.
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Preheat the oven to 220°C. Once set, cut the polenta into 1 cm wide rectangles. Line a oven tray with baking paper and brush it with olive oil. Transfer the polenta chips one by one onto the tray, brushing the top and sides of each with a bit of oil.
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Bake for 25-35 minutes or until golden brown and crisp on the edges.