This is one of several words that Americans stick closer to the French pronunciation while Brits have anglicized it.

Examples:

Café – American: caf-FAY – British: CAFF-fay or CAFF.
Fillet – American: fil-LAY – British: FILL-it.
Garage – American: ga-ROZH or ga-RODGE – British: GAIR-ridge.

But there are also words where the opposite has happened:

Lingerie – American: LAWN-jer-AY – British: LAN-jer-ee.