"a small lunch" is a correct and usable phrase in written English.
You can use it to refer to a light meal eaten in the middle of the day. For example, "I'm just having a small lunch today because I'm not particularly hungry."
A small lunch counter opens onto a deck overlooking the lake.
Sometimes harshly, they critique the show, which is typically a small lunch for a few editors, critics and buyers.
Still, it was a small lunch, so I went back to the cheese shop side to look for a snack to eat later.
Other times, I sat at a small lunch table with only one other physician (plus the rep), having what amounted to a conversation about treating depression.
The pope, who will preside over a gathering of cardinals next week, did receive a birthday torte at a small lunch with Vatican aides.
It started as a small lunch top counter in 1913, back when Miami was still a quiet backwater town, and served fish sandwiches.
City Secret: A small lunch-only restaurant downtown opened quietly a few months back.
This followed a smaller lunch with a US congressman, Charles Rangel.
A recent review of the dietary patterns of 50,000 adults who are Seventh Day Adventists over seven years provides the latest evidence suggesting that we should front-load our calories early in the day to jump-start our metabolisms and prevent obesity, starting with a robust breakfast and tapering off to a smaller lunch and light supper, or no supper at all.
The children were each randomly assigned to three iso-caloric dietary interventions: control (standard breakfast, no snack and standard lunch), intervention A (small breakfast, snack, and standard lunch) and intervention B (standard breakfast, snack, and small lunch), using a cross-over design.
At a small media lunch in Paris at Le Mediterranée, a favorite restaurant, he said that fear of losing his memory spurred him to write this memoir.
