1 small red onion or shallot, minced (about 2 tablespoons)
Method
Bring a medium pot of salted water to a boil, add the oat groats, return to a boil, reduce to a simmer, and cook until the groats are tender (about 25 mintues)
When the oats are tender, place the cleaned green beans in the bottom of a colander and then drain the oats over the green beans allowing the hot water to gently blanch the green beans
Immediately dress with the balsamic vinegar, olive oil, and additional salt
Just before serving add the cut tomatoes and red onion, taste and adjust seasoning as desired