I thought about it for a second and prepared a plain bagel with lox, cream cheese and onion.

She had to order a plain bagel with cream cheese four times.

A plain bagel maybe, if you don't mind.

They were out of plain bagels.

"They have more calories than plain bagels!"

"Black coffee and a plain bagel" can elicit a suggestion to try the kind with sesame seeds next time.

Rose, a plain bagel and black coffee kind of person, quailed at the thought of what a full English breakfast might include.

A waiter finally made it by, and she ordered coffee and a plain bagel.

"Everyone else uses a plain bagel and throws stuff on top," he pointed out.

I bought two plain bagels and a bottle of water, and drove the Beltway for an hour.