Preheat oven to 400 degrees. Place tomatoes on a baking sheet. Place baguette slices on a separate baking sheet. Brush the baguette slices with olive oil.
In a food processor, whip the butter and pesto sauce together until fluffy. Spread onto a cutting board.
Heat a small frying pan over medium-low heat. Add the pine nuts and toast, constantly moving them around the pan to avoid burning. Remove onto a paper towel.
Roast the tomatoes for 10 minutes. Then, place the baguette slices into the oven along with the tomatoes. Let everything cook another 10 minutes. Remove both baking sheets.
Arrange the warm tomatoes, toasts and pine nuts onto the butter board. Serve immediately.