Put the yeast in a small bowl, add the warm water, and whisk vigorously for 30 seconds.
Combine the flour, cornmeal, and malt in the bowl of a stand mixer fitted with the dough hook.
With the mixer running on the lowest speed, add the lard and butter and mix for 1 minute.
Pour in most of the ice water, reserving about 2 tablespoons, followed by the yeast-water mixture.
Continue to mix the dough at the lowest speed for about 1 minute.
Add the salt and mix on the lowest speed for 1 minute to combine.