Add call to action button on image header type

Hello, Im using the Bistro theme and I love every bit of it.

I would however know if it’s possible to add a call to action button in the header of subpages (not the frontpage). I have a food menu setup, but two different restaurants, so I would like to add a cta button the user could click to see the correct menu. The two menus are set below each other with ID’s.