Two new restaurants will open this spring at the Towne Plaza shopping center on Rockville Pike, best known as the former home of Five Guys and Chef Geoff’s. Nature Kitchen is set to arrive next month, followed in April by Bambu Desserts & Drinks. Bambu, based in California, serves Vietnamese-inspired fare from sweet coffees, bean-based chè drinks and fruit smoothies to crêpes and bánh mì sandwiches.