Robusta coffee is the second most popular coffee in the world. It has a taste of earthy and often said to have a bitter, rubbery or grain like flavor and with a peanutty after taste. It contains more caffeine and less sugar than Arabica beans. It taste more stronger. Robusta is known best blend to Arabica. So if you like more on earthy taste, a little robusta will do. Or if you are after a nice thick cream on your espresso, then a high quality robusta might do the taste.