Clean brussels sprouts, cut in half and put in food processor. When fully chopped, put in bowl.
Drain garbanzo beans and add to bowl.
In a separate bowl, combine mustard, olive oil, vinegar and salt and pepper until creamy. Combine in bowl with other ingredients and toss.
Taste. Add more dijon, salt, pepper, vinegar or oil to your taste.
Add cheese and lightly toss. Garnish with lemon slice. (optional)