[header] How to make pan dulce [title] Combine the yeast and warm water. [step] Add ½ cup (118 ml) of warm water to a large bowl, and sprinkle 1 packet (¼ ounce/7 g) of active dry yeast over it. Stir the two together to just combine them. 
[title] Let the mixture sit for 10 minutes. [step] It's important to proof the yeast to ensure that it's alive and active.