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Whisk the ricotta and egg yolks together in a large bowl to combine, then whisk in the buttermilk.
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Sift the flour, baking powder, and salt into the ricotta mixture.
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Stir with a whisk until just combined.
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Using an electric mixer, beat the egg whites and sugar in a large bowl until stiff peaks form.
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Using a large rubber spatula, gently fold the egg whites through the batter in 2 batches.
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Gently fold the blueberries into the batter.
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Melt some butter on a hot griddle pan over medium-low heat.
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Ladle the batter onto the griddle and cook 3 hotcakes at a time for about 3 minutes per side, or until the hotcakes puff, become golden brown and are just cooked through
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Transfer the hotcakes to plates.
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Spoon the warm blueberry compote over the hotcakes then top with a dollop of butter.
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Serve immediately.