A West Indian proverb holds, “If you are the big tree, we are the small axe.” “Lovers Rock,” the first film made available of Steve McQueen’s Amazon miniseries “Small Axe,” first interpreted the saying as a metaphor for the joyous spirit in the Black British community. But his newest installment, “Mangrove” swings a different emphasis on the rebellious phrase. Frank Crichlow (Shaun Parkes) owns the Mangrove, a new restaurant located in Notting Hill. At all hours of the day, he serves mutton, goat, and fish curry. Or as Frank simply puts, they serve spicy food for a particular palette.