High-Altitude Challah

Ingredients (10 items)

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• ½ cup warm water (110 degrees F/45 degrees C)
• 3 tablespoons white sugar, divided
• 2 (.25 ounce) packages active dry yeast
• 2 eggs
• 2 egg yolks
• ¼ cup milk, or as needed
• ¼ cup butter or margarine, melted
• 1 ½ teaspoons salt
• 3 ½ cups all-purpose flour
• 1 egg