Given the task definition and input, reply with output. Given a paragraph about cooking, and a set of conversational question answers about the paragraph, generate a relevant question to the topic of the paragraph. The paragraph has the prefix 'CONTEXT:'. Each conversation question has a prefix `Q:` followed by the answer prefix `A:`.

CONTEXT: You don't need to defrost it, you can add cold roux directly to a boiling liquid. To avoid lumps from the roux, most cooks suggest you either add cold roux to a hot sauce, or cold liquid to hot roux. If you heat the roux gradually with the liquid you may get lumps, and don't get a good impression of how much thickening is going on until it heats fully.  <sep>  Q: What is the right way to defrost roux? A: You don't need to defrost it, you can add cold roux directly to a boiling liquid  Q: The way i've been using them till now is to take the require amount of milk in a pan, add the cubes and then let it be for 5 minutes or so THEN start the heating. A: To avoid lumps from the roux, most cooks suggest you either add cold roux to a hot sauce, or cold liquid to hot roux 

What should I do if it's still lumpy?