Pre heat oven to 375º F convection (400℉ for a standard oven). *See Note 3.
In a large roasting pan with a lid, heat the olive oil over medium-high heat and sauté your onion and garlic, stirring frequently.
1 large onion , ½ cup olive oil, 6 cloves of garlic
When the onion has just started to soften, add the potatoes and sauté for 10 minutes stirring occasionally.
3 medium potatoes
Reduce the heat to medium, and add the tomato paste. Sauté for 2-3 mintues, stirring frequently to avoid buring, until it starts to darken. Note: This step takes the acidity out of the tomato paste.
1 6-ounce can tomato paste
Add the remaining ingredients. Stir well to combine.
1 15-ounce can tomato sauce, 1½ cups water, 1 tbsp salt, ¾ tsp ground black pepper, 2 tbsp dried oregano, 2 lbs green beans
Cover the roasting pan, and place in the oven for approximately 1 hour.
Remove from the oven and stir. Return to oven until green beans and potatoes are cooked to your liking (I cook for another 45-55 minutes).
Notes
Note 1 - Tomatoes: For a lighter feel, use canned diced tomatoes or canned whole tomatoes (chopped or crushed by hand) in place of the sauce and paste. If fresh tomatoes are in season, use fresh grated or chopped tomatoes for a garden-fresh finish.Note 2 - Fresh Herbs: For a fresher finish, substitute the dried oregano with fresh chopped parsley near the end of cooking. Other fresh herbs to try with fresh parsley: mint or dill. Note 3 - Convection setting and Roasting Pan: This is a great dish to use the convection setting on because the dish is covered and won’t dry out easily. If you don’t have a lid for your roasting pan, simply cover it tightly with aluminum foil.