Saute the red onions until they become translucent.
Add the garlic and saute for a couple of minutes to release the oils and aroma. Avoid browning the garlic and onions. Turn down the heat if necessary.
Add crushed tomatoes.
Add the chicken broth.
Add the sugar & pesto.
Add the red chili flakes. Stir to combine all ingredients.
Bring to a boil. Then turn down to a medium low heat.Simmer for 20-30 minutes.
Remove from the heat. Puree soup with a stick blender or in a standard blender.
Add the half & half and stir to combine.
Season with kosher salt.
Serve in a bowl and garnish with a drizzle of pesto and some shredded parmesan. Add a grilled cheese sandwich to savor with the soup on a chilly day. Enjoy!