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Preheat oven to 350-degrees.
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Spray 10" cake pan with cooking spray.
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Sprinkle raw sugar evenly and thoroughly inside pan.
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Slice blood oranges into thin slices.
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Place across the bottom of the cake pan.
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Whisk flour, granulated sugar, baking powder, baking soda and and salt in a large bowl.
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Add eggs, egg yolk, buttermilk, melted butter and blood orange zest and blood orange juice.
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Mix thoroughly but don't over-mix.
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Pour batter over the oranges.
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Bake for 40 minutes, until golden brown.
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Allow cake to cool in pan for @5 minutes.
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Carefully invert pan and release cake from pan.
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Serve caked with blood oranges slices topside.