Dissolve 1 tbsp sugar, 1 tsp salt and 1 packet of yeast in the warmed whey.
In a large bowl, combine the whey mixture and 3 cups of flour.
Cover the bowl with a towel or saran wrap, and let the dough rise for 2 hours (or overnight in fridge).
When the dough has doubled in size, place the dutch oven with lid in the oven and preheat oven to 450F.
Turn the dough onto a well-floured surface or parchment paper. Pull 4 sides of the dough into the center, and then flip the dough upside down so the seams are underneath and the dough is rounded on top.
Once oven has been preheated, remove the dutch oven and lightly flour the pot. Place the dough seam side down into the pot. Lightly flour and make a few cuts in the top of the loaf.
Bake for 25-30 min covered, and then bake for 5 mins uncovered or until the loaf is medium-dark brown. The loaf will sound hollow when you knock on the top.