In a sauce pan, heat olive oil over medium heat. Add in onions and ginger, cooking for 1-2 minutes. Next, stir in rhubarb, water, honey, and chilies. Let simmer until rhubarb has broken down and sauce comes together. Add a pinch of salt and taste to adjust seasonings (if you want it sweeter, add more honey or if you want it spicier, add more chiles.)
Prepare noodles according to directions, drain, and set aside.