Heat oil in a skillet with tall sides over medium heat. Add the onion, garlic, salt and pepper and cook, stirring, until the onion is translucent, 3 to 4 minutes.
Add the farro and continue to cook, stirring, toasting the farro until it is fragrant, about 3 minutes.
Add the harissa paste and stir to combine. Then, pour in the broth and bring the contents to a boil. Once boiling, reduce the heat to a vigorous simmer, Cook until the farro is chewy and tender, 15 to 20 minutes.