INGREDIENTS
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1 tablespoon active dry yeast
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1/2 cup sugar
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1/2 cup lukewarm water
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1 teaspoon salt
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1/2 cup unsalted butter
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3/4 cup milk
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1 vanilla bean, split
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Grated zest of 1 lemon
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3 large eggs
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4 cups all-purpose flour
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Topping:
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3/4 cup unsalted butter, softened
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1/2 cup sugar
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3/4 cup packed brown sugar
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1/3 cup ground almonds
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1/3 cup ground walnuts
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1/2 teaspoon ground cinnamon
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1/2 teaspoon vanilla extract