Place 1/3 cup finely diced onion, 1 tablespoon freshly squeezed lime juice, 1 seeded and diced Roma tomato, 1 seeded and finely diced jalapeño, and 1 tablespoon finely chopped fresh cilantro in a small bowl. Stir to combine.
Halve and pit 1 pound ripe avocados. Scoop out the avocado flesh with a large spoon and place in a medium bowl. Using the back of a fork, smash it into a chunky consistency. Add 1/2 teaspoon kosher salt and a dash of hot sauce if desired, and mix to combine. Add the tomato mixture and gently fold to combine. Taste and season with more kosher salt and lime juice as needed.
