Why are there so few women chefs?

Have you ever heard of the term "pizza girl"? Or "pizza woman"? Chances are, you haven't. There more commonly referred to as "Pizza guys" or "pizza men". This is because pizza making is a male dominated field. Where I work, there is not a single woman on the pizza line, or in the kitchen for that matter. I've always found that to be quite odd. At home the "traditional" role for women is to be in the kitchen and to cook, but in restaurants that I've worked at, there's no women cooking. If the kitchen is made out to be a place for women, why is there no women in kitchens at restaurants? Now I'm certain that there are women working at high class and common restaurants all around the world. Research and studies have shown that approximately 20 percent of all chefs are women. Let that sink in. Only 20. Why is that? Perhaps the expected role of a chef in restaurants is to be a male, while at home the chefs should be women and mothers. 

I think there should be more women in the kitchens of restaurants. Somehow we've built a culture where women should cook for families but not as a way of income. There is a flaw here. The aura of being a chef has somehow become masculine. There is no reason that women shouldn't be head chefs at 3 star michelin restaurants. Personally, I would love some diversity at my employer. I think that gendered spaces are detrimental, especially in places where it shouldn't be.