[header] How to make carne asada [title] Combine the marinade ingredients. [step] In a large bowl, whisk together all ingredients except for the steak. [substeps] Make sure to use a bowl or baking dish made from a non-reactive material, like glass. 
The acid in the vinegar and lime juice can react with metals like aluminum, making them a poor choice. If you are unable to find fresh jalapeno peppers, you could also use a serrano chile, which is just about as hot as a jalapeno is.