This rich and creamy milkshake is made with guavas - a tropical fruit native to Mexico, Central America, the Caribbean, and South America. With a yellowish green skin and a pink or yellow inside, guavas taste like a combination of pineapple and passionfruit. This Latin-inspired Guava Milkshake is made with guavas, cinnamon, vanilla, milk, and ice cream. High in potassium, fiber, and vitamin C, look for guavas in the tropical fruit section of your grocery store. Chose guavas that are a light yellow, free from blemishes or bruises, and soft enough that the fruit gives slightly to pressure.