The menu at Boomerang is vast. Truly deep. Every fruit juice under the bright Brazilian sun is represented, and the various benefits held within are thoughtfully explained on your placemat. The açaí is excellent, and the bowlful (R$6.50), rather than the usual 300ml (R$4.50) cup, really will put a spring in your step. Build-your-own salads (R$13), jacket potatoes, great burgers and sandwiches and a decent breakfast selection make it a suitable pit-stop any time of the day, and the chocolate milkshakes (R$9) laden with crunchy treats and complete with a satisfyingly oversized straw steal the show. Other outlets can be found in Laranjeiras (Rua das Laranjeiras 76, Laranjeiras, 2225 5001) and Humaitá (Rua do Humaitá 88, 2226 2000).