"cooking lunch" is a grammatically correct phrase and can be used in written English.
Example: He spent the morning preparing and cooking lunch for his family.
COOKING LUNCH I'm the only cook in the house.
I was busy cooking lunch.
Down the hall, Fawzia al-Dali, 51, was cooking lunch.
Inside, the famous Cali-Thai chef, Tommy Tang, was cooking lunch.
And while you're hard at work the warden will be cooking lunch on a bonfire.
On his first day he became dehydrated while cooking lunch over the wood-burning grill and two ranges.
When I left the school and started cooking lunches for the three partners of a law firm in Whitehall, I more or less cooked my way through its 1,100 pages.
Eventually, with no formal training, she began cooking lunches there.
The toilets are shabby and the sports hall is "decrepit", but Baker has had to cut back on maintenance spending to stay afloat: in fact, he is trying to raise extra income by cooking lunches for neighbouring primary schools struggling to provide their infants with the Liberal-Conservative coalition's free school meals.
Who's cooking Christmas lunch?
"Women aren't staying home cooking breakfast, lunch and dinner anymore.
