Peel and crush the garlic with the back of a large kitchen knife.
In a heavy bottom skillet, heat the olive oil over medium low heat and add the peeled garlic and crushed red pepper flakes or chopped fresh chili. If you like spice, add the chili flakes (1 teaspoon is plenty but if you like really, really spicy food, use 2 teaspoons). Cook, stirring frequently, until the garlic just starts to turn golden, for about 2 minutes, being careful it doesn’t brown or burn.
Add the salt, sugar, canned tomatoes and their juices to the pan, crushing the whole tomatoes with your hands or cutting with a pair of kitchen scissors as you add them. Turn the heat up to medium, bring to a simmer and crush the tomatoes with the back of a wooden spoon to help them break down.
Reduce the heat to low and simmer for about 20 minutes, stirring occasionally, until the sauce thickens and the tomatoes have broken down.
Check for seasonally and adjust, if need be. Remove the garlic cloves. You can puree the arrabbiata sauce if you prefer a creamier version.
Serve with cooked pasta, preferably al dente or store in the refrigerator in an airtight container for up to 4 days.