Place the cucumber slices in a bowl and sprinkle the salt over it. Mix well and allow them to sit for 15 minutes.
In the meantime, dissolve the sugar in the rice vinegar.
The cucumbers will have softened and lost some water. Pour out the water and pour the vinegar over the cucumber slices. They are ready to use.
Red Curry Peanut Sauce
Over medium heat, cook the red curry paste in 2 tsp of oil (about 2-3 minutes). You want it to be fragrant but never brown.
Pour in the coconut milk and bring to a simmer (2-3 minutes). Mix in the fish sauce and brown sugar.
Add in the peanut butter and stir until fully incorporated.
Add in lime juice to taste and adjust to taste. Due to the difference in peanut butter brands, you may need to adjust the taste with salt (not fish sauce) and brown sugar.
Assembly
This part is where you jam everything into a Flour Tortilla. You are the boss at this stage.