In a large non-stick pan, heat olive oil. Add garlic and cook for 1-2 minutes. Add green beans and cook for 7-8 minutes until they soften slightly. Stir in mustard and lemon juice and remove from heat.
Salt and pepper to taste.
Recipe by Things I Made Today at https://www.thingsimadetoday.com/2014/09/03/simple-mustardy-green-beans/