Add the tin of tomatoes to a small food processor or a blender and pulse until smooth.
Heat olive oil in a saute pan over high heat.
Add onion and drop the heat to medium, saute until softened.
Add the bell pepper, and cook for a minute.
Add the pulsed tomatoes and raise the heat to medium-high. Season with coarse sea salt.
Cook for 4-5 minutes stirring occasionally until the tomatoes start to drain.
Add 2 cups of hot water or stock (500ml) and the oregano and bring to a boil.
Add the meatballs and drop the heat to low. Simmer covered for 15 minutes.
Add the basil and parsley and raise the heat to medium.
Cook partly covered until the sauce thickens.
Mix in the pasta and take off the heat.
Serve with hard, grated cheese, grated Mizithra cheese, or finely crumbled feta cheese.