Idiom:

Rack your brain ( try to find answer )

Hit the book:
Approachable
Substitution
Recommendation
Take order
Crouch
Paraphrase
Unconsciously
Assure
Run out

Make yourself seem approachable when taking orders. People will have questions, want to make substitutions, and may even want recommendations. When taking orders, stand close to the table, and even consider crouching slightly so that you're nearer to eye-level. In some studies the closer a waiter gets to the table, the higher their tips became