Slice Tomato into 1/4 inch slices. Add sliced onions, 1 tablespoon of olive oil, a pinch of sea salt and 2 turns of black pepper from a peppermill. Place tomatoes on a plate, layering the tomatoes in a single line. Top with burrata cheese, basil and drizzle remaining olive oil and balsamic vinegar. Finish with another pinch of sea salt and 3 more turns of black pepper from a peppermill.