In a medium saucepan, heat the 2 teaspoons olive oil over medium-high and saute the onion until tender and translucent. Add the garlic and saute another minute or so. Turn the heat to low, add the rhubarb, orange juice, and ginger, and stir. Cook, stirring occasionally until the rhubarb goes tender without completely losing its shape. Add the honey and a generous pinch of salt. Stir. Taste and adjust seasoning as needed.