My Mother's Marinara Sauce

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2 tablespoons extra-virgin olive oil

2 small yellow onions, peeled, halved and cut into thin slices

2 medium carrots, peeled and cut into thin slices

5 cloves garlic, peeled, halved and cut into thin slices

2 teaspoons red pepper flakes

Kosher salt

1 teaspoon granulated sugar

1 (28-ounce) can whole tomatoes

1/2 cup basil leaves, washed