When you try to hold in a laugh while you're presenting but your a-hole friends keep doing stuff

What does bts stand for? what is the importance of bts? who first started it?

Culinary arts- a serving of seafood appetizers is arranged on a bed of ice. dipping sauces are in the center with a tiny spoon for dishing them out. what technique did the chef apply to make the arrangements? the chef applied the technique to make the arrangements

What is the name of the piece above?