Like most kitchen drain partical blockages, grease is the problem.
Snaking or using a plunger is only a stop gap as either one only removes some of this debris build up. Chemicals I found are not only useless but dangerous.
Your best bet is to hire a licensed plumber and have him her water jet this line.
Think of it like this.
Place your finger in a jar of grease, mud, or other soft material and pull it out, SEE the hole close up again? Same with a grease stoppage it must be flushed away and snaking isn’t going to do it. Have fun