Prepare rice according to package directions, if using.
Warm olive oil in a large skillet over medium heat.
Add the onion, broccoli, kohlrabi, and carrots to the skillet. Cook for 10 minutes, stirring occasionally, until the onions are translucent, the carrots are lightly browned, and the broccoli and kohlrabi are beginning to soften.
Add the edamame to the pan. Continue cooking for another 5 to 7 minutes, stirring occasionally, until the kohlrabi is fork-tender. If your kohlrabi came with its greens, roughly chop a couple of leaves and add it to the skillet at the same time as the edamame. You may want to add a couple tablespoons of water to help cook the leaves.
In a small bowl or measuring cup, whisk together the soy sauce, honey, rice vinegar, garlic, and ginger until the honey has dissolved.
Pour the sauce into the skillet, stirring well to coat the vegetables. Cook for a few more minutes to allow the vegetables to soak up the flavors.
Remove from heat and serve over rice. Garnish with scallions.
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