Place the parsley, Romano cheese, pepitas, lemon juice, garlic cloves, and salt in a food processor. Pulse until the parsley is finely chopped.
Turn the food processor into the on position and let it run while adding the olive oil. Once the olive oil is incorporated, turn the food processor off.
Freeze pesto for use later in ice cube trays, or use immediately, tossing with pasta, roasted vegetables like butternut squash or green beans, or use as a rub for roasting chicken or pork.