Once she took Jill and me to Burger King. We didn't order a well-done hamburger,

Once she took Gillan and me to King's Burger. However, instead of asking us for a medium-rare hamburger, she told the person behind the counter, "They want two medium-rare sweets (the meaning of this whipper is not necessarily correct)". Jill laughed her head off, but I'm going to die.

Is this a joke? For example, granny Liu enters the Grand View Garden? Because only meat has the concept of being a little cooked.