The name is a joke: in 1959 a group of Basque customers at Café Madrid kept ordering 'agua de Bilbao', their nickname for cava, so bartender Constante Gil mixed cava with Valencian orange juice and called it 'agua de Valencia'.
Agua de Valencia blends fresh-squeezed orange juice with cava, usually with gin and vodka added, served ice-cold in a large shared pitcher and poured into glasses. It's sweet, citrusy, and fizzy, and drunk in rounds among friends rather than sipped solo.
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