Salt the tomatoes and layer on the bottom piece of bread with the mozzarella and basil. Drizzle with Basil Oil. Top with the remaining piece of bread. Slice into portions.
Add the basil to boiling water for 45 seconds to 1 minute. Remove to a bowl of ice water to stop it from further cooking. Dry and add to a blender. Add the olive oil, and blend until smooth. Strain through cheesecloth into a bowl. Add salt and pepper to taste. Add the lemon juice right before serving. Yield: About 1 cup.