Steam the green beans. I like to do this one of two ways: 1. In the microwave - cook on high for 4-8 minutes inn a glass covered dish, or until just tender crisp. 2. On the stovetop - place the green beans into a steamer basket set in a pot over simmering water. Steam until tender crisp, about 5-7 minutes, depending on size of the beans and how tender your like them.
While beans steam, combine the stock, vinegar, monk fruit, and miso in a large bowl. Stir to combine evenly and set aside.
Add the green beans to the bowl with sauce and toss to coat. Serve.