Nanik Soelistiowati, the owner of a banana fritter stall in West Jakarta, is the unlikely prize in a battle between two of the most valuable technology start-ups in Asia.The 64-year-old woman signed up for Gojek’s new food delivery service in 2015 after hearing about it from her children. Delivery motorbikes slalomed through traffic jams to deliver her delicious snack, which uses honey for a caramelised flavour, to all parts of congestion-choked Jakarta. Sales took off.Then in 2017, rival Grab…