Sweet Potato Cakes with Kale and Bean Salad

3 sweet potatoes, peeled and shredded

2 green onions, thinly sliced

1/4 tsp. salt

1/4 tsp. pepper

1/4 c. light mayonnaise

2 tbsp. lime juice

1 tbsp. soy sauce

5 oz. baby kale

2 14 oz. cans no-salt-added black beans, rinsed and drained

2 c. shelled frozen edamame