I like fruit, though you need to be aware as it doesn't settle very well for some people. Maybe a cookie or two, too many and it can bring on some dry mouth issues.
I also like a hot cup of chocolate or fruit tea.
A hot cup of soup - I'll even take those instant pack ones (skip the noodles!), if I don't have homemade.
A thermos with boiling water and a travel mug are standard equipment when I head out for a dive - no matter the season. It's there if I need it and if I don't, no biggie.
A big bottle of cool water - frozen in the summer to thaw between dives - is also an essential.
For me fluids are more important than solids.