Place dough in an oiled bowl. Cover, for about 45 minutes, and allow dough to rise. Preheat oven to 400 degrees. Press dough into greased pizza round pan. Spread pesto over dough. Place tomatoes over pesto. Place mozerrella over tomatoes. Top with thinly sliced red onion. Drizzle more peston on top of pie. Bake for 15-20 minutes or until crispy. Serve hot.