Begin by adding all the ingredients—Havarti cheese, sun-dried tomatoes, salami, cornichons, Castelvetrano olives, and fresh basil—into a medium-sized mixing bowl. Use a wooden spoon to gently stir everything together.

Once well combined, transfer the mixture into a mason jar or a serving bowl. If using a bowl, cover it tightly with plastic wrap.

You can either serve it immediately or let it marinate in the fridge. For maximum flavor, let it sit in an airtight container for up to a week.