For best results, use high-quality, ripe heirloom tomatoes at peak season. If you don't have truffle oil, you can substitute with a drizzle of regular extra virgin olive oil and a pinch of truffle salt. To prevent the bruschetta from becoming soggy, serve the tomato mixture in a separate bowl and let your guests assemble their own. Consider adding a sprinkle of Parmesan cheese or a balsamic glaze for an extra touch of flavor. Feel free to grill the baguette slices instead of toasting them in a skillet for a smoky flavor.