Step 1: Activate the Yeast - In a small bowl, combine the active dry yeast, 2 tablespoons of sugar, and 1/2 cup of warm water. Stir gently and let it sit for about 5-10 minutes, or until it becomes frothy.
Step 2: Prepare the Dough - In a large mixing bowl, combine 4 cups of all-purpose flour and salt. In a separate bowl, whisk together the beaten eggs, 1/4 cup of sugar, the remaining 1/2 cup of warm water, and canola oil. Once the yeast mixture is ready, add it to the egg mixture and stir until well combined.
Step 3: Combine Ingredients - Gradually add the wet ingredients to the flour mixture, stirring with a wooden spoon. Knead the dough until it is smooth and elastic.
Step 4: Let it Rise - Shape the dough into a ball and place it in a lightly oiled bowl. Cover it with a kitchen towel and let it rise in a warm place for about 1-2 hours, or until it doubles in size.
Step 5: Shape the Challah - Once the dough has risen, punch it down. Divide the dough into three equal pieces, roll each piece into a long strand, and braid them together.
Step 6: Second Rise - Place the braided dough on a baking sheet lined with parchment paper. Cover it and let it rise for another 30-45 minutes.
Step 7: Preheat the Oven - Preheat your oven to 350 degrees F (175 degrees C).
Step 8: Prepare for Baking - Brush the top with the beaten egg yolk and sprinkle poppy seeds if using.
Step 9: Bake - Bake for 25-30 minutes, until golden brown and sounds hollow when tapped.
Step 10: Cool and Enjoy - Let the bread cool on a wire rack. Slice and enjoy!