Scoop or cut the inside flesh out. Place some of the flesh into a blender to blend into watermelon juice
Remove the outer peel and discard
Cut the rind into bite size pieces
Place rind into a bowl with salt, sugar and mix
Let it sit for 1 hour
After 1 hour, dump out the excess liquids. Fill the bowl with fresh water and wash the rinds thoroughly. Put the rind into a fresh bowl
Add in watermelon juice, garlic, soy sauce, honey, vinegar and Korean red pepper flakes. Mix
You can eat it right away or let it sit in the fridge up to 2 weeks.