Prepare the starter: Mix warm water, flour, and yeast. Let it sit for 30 minutes until bubbly.
Make the dough: Dissolve yeast and sugar in warm water. Add lard, salt, and flour gradually, kneading until smooth.
Let it rise: Cover and let the dough rise for 1-1.5 hours until doubled in size.
Shape the loaf: Punch down the dough, shape it into a log, and place it on a baking sheet with cornmeal.
Second rise: Cover and let it rise for another 30 minutes while preheating the oven to 400°F (200°C).
Bake with steam: Score the top, place an oven-safe dish with hot water inside, and bake for 20-25 minutes.
Check for doneness: The bread should be golden brown and sound hollow when tapped on the bottom.
Cool and enjoy: Let it cool slightly before slicing and serving!