Since the Cats & Dog DLC, I've been unable to click on the stove or fridge to hire a caterer/vegetarian caterer.
Initially, I thought the problem was caused by a glitch in the premade houses my sims moved to.
Later, I learned that it's a known bug.
Today, I tried buying both of the chef stations and was delighted to note that they both offered a "Hire chef ($800)" option.
My sim sold one of the chef stations then used the other to hire a chef.
Don't bother! That chef came by and spent hours alternately stirring one dish and frying another, then left without finishing either, lol.
My sim could just cook herself or get her clubmates to cook, but I still miss being able to hire a vegetarian caterer!