What do they eat for lunch and for supper?

M: What food shall I buy today?
W: I want a green salad for lunch. For supper, I want some meat.
M: What kind of meat, madam?
W: Beefsteak.
M: How much beefsteak do you want?
W: About 2 pounds. Do we have enough bread and potatoes?
M :We have enough bread. But we don’t have enough potatoes. Shall ! buy some potatoes?