In a bowl, crumble the yeast, sprinkle with sugar, and pour in warm water. Let it rise. Then sprinkle with whole grain flour, add salt, lard, and knead into a soft, elastic dough. Cover with a cloth and let it rise for about 45 minutes. Roll out the dough. Roll each half into a rectangle and tightly roll it up. Transfer to a baking sheet lined with baking paper, cover, and let it rise again for 45 minutes. We can shorten the rising time by using a combi steamer as a proofer. After rising, bake until golden.