[header] How to make bolillos [title] Proof the yeast. [step] Place 1/2 cup (125 ml) of warm water into a large bowl and add the yeast and sugar, stirring gently to mix the ingredients evenly. Allow the mixture to sit for 5 to 10 minutes, or until foam starts developing on the surface. 
[substeps] If the yeast mixture does not become foamy, that means the yeast is dead or will otherwise not activate. As a result, the bread will not rise if you continue forward from here.