Is this a good idea, or will some of the taste of the eggs seep through the shell and affect the taste of the coffee made from the boiling water?
Boiling the water for ten minutes with an egg in it will alter the flavor some. How much depends on what is on the egg, how much water, and how porous the shell is. Some claim that water boiled that long without the egg will not make good coffee, although I have never seen anyone pass the blind taste test on that one.
Get a Mr. Coffee, or equivalent. Worth the money, and there is no better way to make coffee. (By the way, let that boiling water cool down to 180 degrees, before using it for coffee.) Or, if you really like hand brewed, and you are willing to go the extra to get fresh beans, grind them for each brew, and make only enough to use in twenty minutes, (all of which matter a lot more) you can make the cup of coffee first, then put in the egg. (Pierce the fat end of the egg with a pin, and it won’t leak if it cracks)
If you brew it up in a pot, leave it sitting all morning in a hot pot, rewarm it in the microwave by the cup, then what the hell, boil an onion, and some cabbage along with it, what the heck.
Aside from the Mr. Coffee, you can buy single-cup brewing devices. They’re fairly rapid, simple to clean, and use a re-usable filter. For a cup or two, they’re a lot better than a full-size coffee brewer.
Or, for about 40 bucks, buy a hot water boiler for the sink. Drill a hole in your sink (or pop the plug), put in the boiler, connect the water, and plug it in. Voila–constantly instant 190-degree water. Good for instant coffee.
Not my favorite, but if you’re already drinking egg-flavored water, instant’s not that much worse.
If you read this post you will see why you do not want to boil all of the oxygen out of your water by cooking the egg before brewing the coffee.
I would be concerned about the taste of the chicken’s vaginal secretions.
I mean you do know where eggs come from, don’t you?
And Triska baby, aka Mr Always Correct, don’t try and tell me chickens haven’t got vaginas. I mean they have lips don’t they?
Redboss
When making “cowboy coffee”*, a few egg shells in the pot are supposed to help the flavor. If you’re already making coffee with egg shells in it, why not leave the egg in the shell? That way you get both egg flavored coffee, and coffee flavored egg for breakfast. I vaguely remember something about G.I.'s in foxholes or trenches, and cooking and entire meals in their steel pot helmets all at once. Grampa might have been pulling my leg on that one.
And Zenster, you don’t boil the eggs before you make the coffee. You boil all of the oxygen out of your water by cooking the egg while brewing the coffee.
*“Cowboy coffee” is when you take a handfull of coffee and throw it in a pot, and boil it till a horseshoe floats. Personally, I drink tea. Earl Grey, hot! (with honey)