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Mighty Leaf Tea was born for the sole purpose of infusing life into an ancient indulgence by creating tea products that reach new heights of quality and innovation. he genesis of Mighty Leaf Tea came in 1996 as a result of a shared passion and dream envisioned by husband-and-wife team Gary Shinner and Jill Portman when they founded their teahouse on Fillmore St. in San Francisco. The genesis of Mighty Leaf Tea came in 1996 as a result of a shared passion and dream envisioned by husband-and-wife team Gary Shinner and Jill Portman when they founded their teahouse on Fillmore St. in San Francisco. Their passion is for creating the most incredible handcrafted tea blends found anywhere, globally sourcing the finest ingredients available. Paralleling the highest standards of quality at Mighty Leaf Tea is ongoing creative innovation.