These burgers will swell up as you cook them. They will be so moist when you do eat, you will think you are eating a juicy pear or etc!
That time frame works with about any meat that thick, too. Like steaks I turn the grill up as hot as it will go (preheat), do a minute each side on the bottom and then do about 3 minutes each side on the upper rack. That will get you about a good meduim steak every time.
I never cut anything open to test it's doneness, it's all by touch. You can push on the meat with the side of the spatuala or fork to test it's spongyness. Firmer the more done it is. Do it enough and you'll start knowing how 'firm' you like your 'meat'!
