the logo should visually represent a barbershop and our burger restaurant.
As both places should make visitors feel the same, so should the logo - warm, cool but decent, proud of knowing the place, at the same time they should feel they're at home (that's what they feel here).

But as mentioned the burger restaurant is opened only in Summer and the main focus will be barber shop, the logo should also not be more burgers than barber but they both should fit somehow on it.