The four-week trial lunch offer from South Kesteven District Council concluded on Sunday with 52 people sitting down to enjoy the carvery.
With a break this weekend, the family-friendly weekly lunches will re-start on Sunday 20 September, with the possibility of expanding the offer to market day on Thursdays.
Cllr Rosemary Trollope-Bellew, SKDC Cabinet Member for Culture and Visitor Economy, said: "We are delighted to see what a success this has been, and it's encouraged us to continue what's proved to be a very popular Sunday meal out.
"We have been able to show that we can comply with all Government guidance on serving food and it's clearly reassured customers that they can feel safe in enjoying a superb freshly prepared and healthy lunch out."
All meals and drinks are delivered to tables as per Government guidance and, with places limited, advance booking is required.
The Exchange 1870 Carvery - taking its name from the date the Corn Exchange was built - offers a four-meat carvery, with vegetarian options and a minimum of eight hot or cold desserts together with complimentary soup and a fully licensed bar.
Lunches will be available every Sunday from noon; adults £13.95, under-12s £8.95, and under-fives £4.95.
To book, call 07486 454372.