Butter Shortbread Cookies.
Wonderful and easy-to-make cookies that you just can't stop eating.
They are crunchy and crumbly but melt in your mouth at the same time.
(scroll down for the English version)
I wish I could write the definition what a perfect burger is once and for all, but that is not on me. I can only offer you some directions and hope to help you a bit, or at least share with you one more option.