I have googled Mexican BBQ. It seems that is where it comes from although I think most S American countries say the same. It looks slightly different to ours! I would go to google images and print off pics of local BBQ. Elicit the word form them. Ask what they cook on their BBQ - this activates schemata. If you have different Ss then this helps as you get them to converse about their BBQ.
Start a new post regarding going to future otherwise this will get lenghty. I will answer, I promise. But repost regarding that lesson also think about what will be taught in that lesson. I think other present tenses will also be taught regarding the future. Consider I'm cooking tommorrow and I'm going to be cooking tommorrow.
The same way you created this one. Ask a new question. People will see lots of posts and not bother giving their input as they will think the answer has already been provided.