Peel sweet potatoes Chop potatoes up into small bite sized cubes. Boil for 10 min or until soft. Drain using a colander. Let sit in colander until cool. While waiting on potatoes to cool Chop up green onion. Cut cucumber into bite sized quarters Set aside Make mustard sauce in separate bowl Whisk Dijon mustard, apple cider vinegar, olive oil, salt, paprika, crushed garlic into bowl. Put all vegetables into a large mixing bowl and coat with mustard sauce. Mix until all vegetables are coated. Refrigerate for 30 min.