Food arithmetic?

Liam: Daddy, what's the square root of meatloaf?

Me: The huh?

Liam: Chicken.

Me: Huh?

Liam: What's the square root of yogurt?

Me: Forty two.

Liam: No! It's pudding!

Me: Pudding is the square root of yogurt?

Liam: Yes, it is a new math I'm inventing.

Me: Based on food?

Liam: Yeah. I'm writing a book on it. And I'm going to invent a calculator. And a pocket book. And a formula.

Me: Food arithmetic?

Liam: Yeah, Daddy! That's what I'm inventing: food arithmetic.

So. That's what he's inventing. My boy. The Isaac Newton of culinary sciences.