The beverage called London Fog originated during the Victorian era. Traditionally, it is an Earl Grey served with steamed milk. A flavorful back tea blend, the sweet notes of vanilla come through with undertones of bergamot and lavender. Contains caffeine. 40-60 mg per cup. A 4 ounce tin of loose tea brews 30 to 40 cups of tea. HARNEY & SONS IS A PROUD MEMBER OF 1% FOR THE PLANET. Joining 1% for The Planet meant we could directly donate one percent of our total sales to the environmental organizations of our choice.