Bangalore-based US Pizza Restaurants, which sells the fast food under the brand name US Pizza, will invest more than Rs 500 crore (Rs 5 billion) to open over 1,000 outlets by 2011 for a pan-India expansion.US Pizza is also planning to open more than 40-45 outlets in European countries such as Norway, Sweden, Germany and France and in domestic front, it is planning to enter a new city every month as they are looking to tap new markets by entering tier-II and tier-III cities.