I'm going to tell two squabbling employees of a restaurant to shut the hell up
What do you expect from your employees?
As an owner I want to run a peaceful restaurant. Otherwise my customers will not enjoy their time here.
Employees who squabble at their place of employment is quite harrowing, but yelling isn't the resolve here. Talk to them and take them aside to explain that if they continue there will be consequences. You won't be needing them there anymore, they will be fired if they keep at it.
That is why I'm going to create a loud scene.
If you scream at your employees that's not gonna be a good message to other employees. You're an owner of the restaurant and you should set an example of a good leader.