Do you explain a price increase?
An excellent, mid priced, long established, restaurant raised prices a few months ago. They have a little red sign on the menu saying that salad is no longer included (entree prices remain the same) due to "high food costs". Each time we go in the server brings it to our attention. Salad is now $2, with a meal.
First, I don't think that overall food costs are up that much. Maybe "delivered" food costs are up though. A major restaurant supplier has been advertising for drivers at "a new higher pay scale" with a sign on bonus.
Second, IMO,labor is the biggest cost driver in many lines of business today. Food people have been under paid for years, and I personally know of 2 former restaurant pros who have moved on to higher paying work.
I'm in business, but not the restaurant biz. IMO higher prices are a fact of life, especially in a low margin biz. I'd suggest that restaurants raise prices, as needed, and don't make excuses.