Mix the instant yeast and sugar (or omit the sugar and use 1 teaspoon of the flour) in a small mixing bowl. Add the warm water and stir to dissolve. Let it sit for 5–10 minutes until it becomes frothy.
1 envelop Active Yeast, 1 teaspoon Sugar, 1½ cup Water
In a another mixing bowl, combine the flour and salt. Make a well in the center and pour in the yeast mixture and the remaining warm water. Mix with a wooden spoon or your hand until a rough dough forms.
4 cups Bread Flour, 2 teaspoon Salt
Transfer the dough to a lightly floured surface. Knead for about 10 minutes until the dough becomes smooth, elastic, and slightly sticky. If it’s too sticky, add a little more flour.
Shape the dough into a ball and place it in a lightly oiled bowl. Cover the bowl with a damp cloth or plastic wrap. Let it rise in a warm place for 1-2 hours, or until doubled in size.
After the first rise, gently deflate the dough and turn it out onto a floured surface. Divide the dough into two equal pieces.
Working with one piece at a time, shape the dough into a rectangle. Fold the long edges into the center, then roll the dough into a log, pinching the seams closed. Roll it back and forth to elongate the dough to about 30-35 cm (12-14 inches) long.
Place the shaped dough on a baking tray. Cover the dough loosely with a cloth and let it rise for 45 minutes to 1 hour.
Preheat your oven to 450°F and add a shallow pan on the bottom rack. If you have a baking stone, add it to the center rack.
Just before baking, pour 1 cup of boiling hot water into the shallow pan at the bottom of the oven. This is called a water bath and it will create steam, which helps form a crispy crust.
Using a sharp knife, lame`, or a razor blade, make 3-4 diagonal slashes on the top of each baguette. This helps control the expansion of the bread as it bakes.
Place the baguettes directly on the baking sheet. Bake for 20-25 minutes until the crust is golden brown and the baguettes sound hollow when tapped on the bottom.
Transfer the baked baguettes to a wire rack to cool completely before slicing.