Add chopped green onions in a small blender.
Pour vinegar into the blender.
After vinegar, add Dijon mustard in the blender.
Pour cold water into the vinaigrette mix.
Add olive oil to the vinaigrette mix.
Add honey to the vinaigrette mix.
Season the vinaigrette mix with salt and pepper.
Blend the ingredients to make the vinaigrette.
Take a pan and add butter to it.
Throw sliced onions in the pan.
Add sugar to the pan.
Meanwhile, take another pan and pour water into it along with a pinch of salt.
Add potatoes to the boiling water.
Now, that the potatoes are boiled let's move on to the next step.
Pour vegetable oil all over the potatoes.
Season onions with black pepper.
Now, add salt to the onions.
Combine onions and boiled potatoes.
Lastly, pour vinaigrette into the sweet potatoes.
Your sweet potato hash is ready to serve!