In metric countries, 1 3 4 cup is about 414 milliliters. That’s roughly two small soda cans. Or half a wine bottle. Measure your next glass of milk that way. People will think you’re fancy.
But here’s the kicker: metric recipes don’t use “1 3 4 cup.” They say “400 ml” or “½ liter.” So if you see that fraction on a blog from France, they’re messing with you. Or they’re being cute.
Actually, many European bakers love American fractions. They think it’s charmingly weird. Like our obsession with measuring in teaspoons of sadness.