Add vinegar, oil, and mustard to a mixing bowl, food processor, or immersion blend. Whisk by hand or blend until emulsified. Add salt, pepper, and honey to taste.
Add one-third of Kale Beet Blend to a large glass jar or container. Build your salad in layers by adding bell pepper, cucumber, feta, red onion, egg, seeds, and salt and pepper. Repeat this 2 more times to complete all 4 salads. Divide 3 oz dressing into 4 small to-go containers and pack one with each salad. Keep refrigerated until ready to serve.