Place avocado and lime juice in a bowl and mash well with a fork. Add in grapefruit pieces, cilantro, garlic, green onions, salt and pepper. Stir to combine. Garnish with additional grapefruit or jalapeño slices, if desired.
Add in grapefruit pieces, cilantro, garlic, green onions, salt and pepper. Stir to combine. Garnish with additional grapefruit or jalapeño slices, if desired.