2 cups Great Western onion, chopped
1/4 cup olive oil, plus more for drizzling
2 teaspoons balsamic vinegar
2 teaspoons maple syrup or organic sugar
2 garlic cloves, thinly sliced
4 cups Big Beef tomatoes, chopped, including their juices
2 cups vegetable broth
Sea salt and freshly-ground black pepper, to taste
2 cups fresh basil leaves