Final answer:
The corrected sentence is: 'I ordered many things at the restaurant: a salad, chicken pesto, and tiramisu.' A colon is used to introduce the list of items, and a semicolon is not needed as we are not connecting two independent clauses.
Step-by-step explanation:
The sentence provided can be rewritten correctly using a colon to introduce the list of items ordered at the restaurant. The correct punctuation after the phrase 'I ordered many things at the restaurant' would be a colon since it signals that what follows is an explanation or enumeration of the statement that came before it.
The rewritten sentence is:
I ordered many things at the restaurant: a salad, chicken pesto, and tiramisu.
A semicolon is not necessary in this sentence because we are not joining two independent clauses. The list of items are the details following the independent clause, making the use of a colon more appropriate.
However, to illustrate the use of semicolons correctly, consider this example:
Restaurants and small retailers experienced steep drops in revenue during the pandemic; many were forced to close.
This is a compound sentence in which two independent clauses that are closely related in meaning are joined by a semicolon.