The phrase "to eat a sandwich" means to consume a meal that consists of two slices of bread with fillings in between, usually including meat, cheese, and vegetables. Full definition
I didn't eat sandwiches with lettuce on them or sushi until I got to college. (thefoxandshe.com)
I was embarrassed to explain that I still could not eat the sandwich because of the contamination from the knife. (lawsitesblog.com)
Almost every office worker is familiar with the afternoon energy slump after eating sandwiches for lunch, and eating too many carbohydrates is the cause of it. (supernaturalacnetreatment.com)