It is fairly common for a chef to team up with an investor for this reason - let the chef do the food, and the other party do the business stuff. If you're both

It is fairly common for a chef to team up with an investor for this reason - let the chef do the food, and the other party do the business stuff. If you're both trying to do both or have a too-personal relationship where you can't say no, it can get messy. That's not to say it never happens or can't work, of course.