G.O.P. (1917) ★★★★

It's feeling pretty summery outside this weekend, so here's to sipping cool summer cocktails in the sun!
By the way, did you know the difference between club soda and seltzer water? According to Wikipedia, "The term seltzer water is a genericized trademark that derives from the German town Selters, which is renowned for its mineral springs. Naturally carbonated water has been commercially bottled and shipped from this town since the 18th century or earlier. Generally, seltzer water has no added sodium salts, while club soda still retains the sodium salts."

G.O.P.
Use a large Mixing glass with Lump of Ice.
2 jiggers of Orange Juice.
2 jiggers of Grape Fruit Juice.
Fill with Seltzer Water. Stir; ornament with Fruit and serve with Straws.

The Verdict:
Well, I didn't have any straws or ice on hand, but I don't think it had that great an effect on the taste. One large orange gave me about 4 oz juice, and the grapefruit was maybe double that. I used maybe a 10 oz glass, and that was a nice dilution of juice to seltzer. The taste is nice and fresh, but quite sour. I'm not a huge fan of grapefruit or anything sour, but I would have LOVED this with a bit of sugar or maybe some white grape juice to add a little sweetness. Mr. Man REALLY liked it as is though. Overall, quick and delicious!

Modernized Recipe:
(Adapted from The Ideal Bartender)

1 ICE CUBE

3 oz ORANGE JUICE

3 oz GRAPEFRUIT JUICE

SELTZER WATER

1. Juice an orange and a grapefruit. Alternatively, just use already made juice (I thought fresh would be more authentic - and tastier!). If desired, strain juice through cheesecloth to remove pulp and seeds.
2. In a large cup, add 1 ice cube and 3 ounces of each juice. Fill with seltzer, decorate the glass with fruit, and enjoy through a straw.