The tamarillo fruit is oval-shaped and has smooth and shiny skin. It’s also called tree tomato. The inside of the fruit resembles that of plum tomatoes. Tamarillo tastes sweet yet tangy, and the fruit’s flesh is juicy, deep in color and filled with small, flat and circular edible seeds that are slightly larger than tomato seeds. The inside of the fruit resembles that of plum tomatoes. Tamarillo tastes sweet yet tangy, and the fruit’s flesh is juicy, deep in color and filled with small, flat and circular edible seeds that are slightly larger than tomato seeds.