Heat a medium pot over medium heat, add enough oil to lightly coat the bottom. Add the onion and a pinch of salt, saute for 7 minutes, until soft. Add the rhubarb, ginger, maple syrup, balsamic, and tamari. Bring to a gentle simmer and let stew for 10 minutes, or until the rhubarb is soft. Turn off the heat, add the butter, and stir it in. Taste for salt and adjust if needed. Serve the sauce warm or at room temperature.
Notes
*Our favorite vegan butter is Miyoko's.
Recipe by Golubka Kitchen at https://golubkakitchen.com/savory-rhubarb-balsamic-sauce/