In a small bowl, add the lime juice and the sugar. Stir until sugar is dissolved. Add the fish sauce and soya sauce to the dressing. Taste the dressing and adjust the flavors if desired.
NOTE: Adjusting the flavor of the dressing is all according to taste; whether you like a sweeter dressing, versus a saltier bottom-of-the-ocean flavor, versus a tangy lime flavor - just add more lime juice, fish sauce, soya sauce or palm sugar to adjust to taste you prefer, that is, if it’s not already perfectly to your liking.