The internal color of a burger is not a reliable doneness indicator. A beef patty cooked to 160°F is safe, regardless of color. To measure the doneness of a patty, insert an instant-read thermometer through the side of the patty to a depth of 2 to 3 inches.
(Greek Feta Burgers)
292 calories; total fat 14g; saturated fat 6g; monounsaturated fat 5g; cholesterol 79mg; sodium 356mg; potassium 514mg; carbohydrates 14g; fiber 2g; sugar 3g; protein 27g; trans fatty acid 1g; vitamin a 1069IU; vitamin c 8mg; thiamin 0mg; riboflavin 0mg; niacin equivalents 7mg; vitamin b6 1mg; folate 28mcg; vitamin b12 3mcg; calcium 111mg; iron 4mg.