If serving on a large flat platter, slice tomatoes in 1/4 inch rounds and artfully arrange slices on platter with some overlapping edges and other slices atop the others. Alternatively, if serving in a large bowl, cut into wedges or cubes, and place in the bowl.
Sprinkle salt and pepper over the top. Add more or less to taste.
Drizzle extra virgin olive oil and balsamic vinegar, if using, on top of tomatoes. Add more olive oil, if desired.
Sprinkle arugula microgreens (or thinly sliced mature arugula) over the top and serve. Add more arugula, if desired.
Serve with a knife and fork, unless tomatoes are cut into bite-sized cubes.