mōng gwó hùhng chàh
mong1 gwo2 hung4 caa4
芒果 is the loanword for mango (which is taken from the Portuguese manga which is from the Malay mangga which in turn came from the Tamil mankay), and 紅茶 is black tea, so 芒果紅茶 is mango black tea.
Black tea brewed with mango.