Come to any traditional market in Indonesia, you will find tropical fruits of various kinds, namely banana, rambutan (hairy fruits), dukuh, kokosan, sawo, jambu klutuk (syzigium), salak (snake fruit) etc. Some are all the year fruits,like banana, papaya and jambu klutuk. Some others like mangga (manggos), rambutan, durian, dukuh are seasonal.
There are also variations among each fruit species. There are several varieties of banana,namely pisang raja, pisang mas, pisang ambon, pisang tanduk, pisang batu, etc with various size and taste. Pisang tanduk (horn banana) probably one of the longest banana fruit, its form is like horn of a bull. Pisang tanduk is nice to be fried covered with flour, or to be made as kolak, which is a sweet and usually made during ramadhan, favourite for breakfast menu at dawn time (maghrib).
For mangga there are mangga arum manis, probably one of the most popular variety of mangga, mangga golek (I rarely found this variety nowadays, not like when I was a child), mangga dermayu (mostly produced in Indramayu city), mangga kuweni which is nice for juice, mangga gedong, mangga gedong gincu, mangga madu (one of the most expensive mangga), mangga daging, etc. For several years I noticed that mangga usually plenty during ramadhan (fasting) month which around months of september to January. When it reaches its peak season, the price of mangga as low as Rp 3000 per kg, whereas at the beginning or end of its season it could reach Rp 7.000 per kg.
The price of the fruit actually could be made constant if the supply of the fruit to the market can be regulated. This could be made if there are canning processing industries where some harvested fruits can preserved in canned for later ( more than a year) consumption.