[Skip to 0:25 for the actual gameplay]
The first clip shows how to throw the plates (nope, this is not a cheat). You can do this in case you screwed up at the last minute. Do this by releasing the food, and quickly dash horizontally. Use the arrow button instead of joystick. This trick is very hard to pull off, because you need to time it right to press button, and also because there's table nearby. I've seen a gameplay from my favourite player, where he did this trick constantly, and get almost 1000 (world record for solo gameplay) on this level. I'm really impressed with him, and I don't think anybody else (even me) can pull off this trick that often in one game. If you must know, his channel is Over Tyr, go subscribe him!
Unless you can constantly throw plates across like a professional, 4-star requirement doesn't allow any mistakes. If you screw up at any point (like forgot to cut the ingredients before cooking, or forgot to wash dishes; let alone burn the food), then you should consider restarting this level. There is a specific cycle, cooking and serving in batches of 2, where you should follow. The first cycle starts 15 seconds after the level starts (where the moving platform is at the left side), and the moving platform stops and stays at each side for about 5 seconds before moving. Of course, you should start cutting as soon as the level starts.
Remember that the first five dishes are always the same (for solo players). The rest is randomized. Make sure both of your chefs are cutting ingredients.
When you cook the ingredients, cook them alternately (like pasta-topping-pasta-topping) so that it's easier to send the dishes to the moving table. If not, it will happen like the first clip in this video.
You can (and you should) cook the dishes quickly for the first two cycles, but you need to time it right instead for the third cycle and above. Too early and the dish burns before the clean plates reach to the right side. Too late and the moving platform starts moving before the dish finishes cooking. Check out 1:57 of this video to find out when it is the right time (early and late threshold limit) to cook the dish, relative to where you see the moving platform.
If you do it right, you won't have any problem with this level (and strangely you will always get 770 points). Keep practicing until you get 4 stars.
In a nutshell, here's the thing you need to take care of: washing dishes, both chefs cutting ingredients, and cooking ingredients AT THE RIGHT TIME. If you screw up, you should restart the level. If you did it right, you should end up with 4 stars, specifically 770 points (lol)
Hope you enjoy this video! Stay tuned for more gameplay!
Mister Fudo signing off!