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In a small bowl mix 1 tsp. of sugar with the yeast and dissolve in warm water. Let the mixture sit until it becomes frothy, this should take about 10 minutes.
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As you are waiting, heat the rest of the sugar, milk, butter and salt over medium-low heat until the butter has just melted. Take it off the burner and let cool until use.
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In a bowl of an electric stand mixer with the paddle attachment, stir the eggs, milk and yeast mixtures together. Be sure that the milk mixture is lukewarm to avoid cooking the eggs.
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Beat 1 1/2 cups of flour until smooth, about 2 minutes.
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Stir in the rest of the flour with a wooden spoon until it is well incorporated and the dough has a smooth, slightly sticky consistency.
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In the electric stand mixer with the kneading attachment (or by hand on a lightly floured surface) knead the dough until smooth and elastic, about 10 minutes.
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Place the dough in a large greased bowl and cover with plastic wrap. Let rise in a warm area of your kitchen until it doubles in size, about 1 to 1 1/2 hours (or overnight in the fridge).
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Once risen, punch the dough down and roll it on a lightly floured surface into an 18- by 14-inch rectangle. Cover with plastic wrap and move onto making the caramel topping and filling.