Step 1

Combine all ingredients in a food processor and blend very well until smooth. Taste and adjust salt as necessary.

Step 2

Spread 2 tablespoons of pesto on 4 slices of bread; set aside.

Step 3

Slice the Brie and divide it evenly among the remaining 4 slices of bread.

Step 4

Put the pesto-covered bread, pesto side down, on each Brie-covered slice of bread.

Step 5

Heat a large skillet over medium heat and melt 2 tablespoons of butter in it. Add the sandwiches to the skillet.

Step 6

Cook the sandwiches until golden brown on one side, about 3 to 4 minutes.

Step 7

When ready to flip the sandwiches, transfer them to a plate and add the remaining 2 tablespoons butter to the skillet.

Step 8

Once the butter is melted, add the sandwiches back to the skillet with the un-grilled side facing down. Cook for an additional 3 minutes, until the cheese is fully melted and the bread is crisp and golden brown on each side.

Step 9

Remove from the skillet, cut each sandwich in half, and serve immediately.