This mission starts at the Yellow Jacket bar near Sandy Shores. During the initial cut scene Trevor has brief exchange with the bar tender where she tells him he is banned from the bar. He breaks up a fight to get in her favor. She allows him to stay but warns him about any "bodies" showing up again. A man enters the bar and explains he is a translator for Mr. Cheng. Mr. Cheng then enters and is obviously drunk and completely out of it he wanders around the bar and hugs Trevor. Trevor tries to leave but the translator stops him and begs him to do business with them explaining that Mr. Cheng's father is the one that wants to do business with 'Trevor Philips Corporation' and that they can make alot of money together. Trevor agrees to show him his operation.... You take control of Trevor and they all get in Trevor's truck and start heading toward Trevor's Meth lab. Trevor calls Chef on the way and tells him they are coming to see the 'kitchen'. Chef tells him that the Aztecas are coming because Trevor took out Ortega.
When they arrive at Trevor's Meth Lab, which is above a liquor store, Chef meets them outside in a panic. Trevor makes the translator and Mr. Cheng get in an ice storage freezer outside the store and Trevor and Chef go upstairs and grab weapons during a brief cut scene and this puts Trevor upstairs next to a window in cover mode. You are then in control of Trevor again as the Aztecas arrive in several vehicles. You take them all out as they get out of their vehicles until all the ones outside this window are gone. You and Chef then move to a balcony area at the back of the store where there are several more Aztecas-- you can shoot the big gas tanker outside until it leaks and then shoot the fuel to ignite it and blow up it and a few Aztecas. After the guys in back are all dead, you then move to the east side of the house and out a door where you will find yourself on top of a roof. More Aztecas arrive on bikes and cars and you take them out as they arrive. When they are all dead you and Chef head downstairs and into the liquor store. Using the cover system hide behind the counter and take out the Aztecas as they come into your view. Go outside and them mop up any remaining Aztecas.
After the battle you go back to the ice freezer and let Mr. Cheng and his Translator out. Mr. Cheng is still loopy but his translator is obviously upset and angry about what has happened. Trevor is oblivious to this and tells them "I'll swing by and sign the contracts, just ignore the bodies". As Mr. Cheng and the Translator flag down a car for a ride, Chef yells down and asks Trevor if they are still going to cook another batch and Trevor yells back "F*ck yeah" and then the mission ends.