In a large pot, heat olive oil over medium heat. Add the chopped onions, garlic, carrots, celery, and potato. Sauté until vegetables are tender, about 5-7 minutes.

Simmer the Soup

Pour in the vegetable broth and bring to a boil. Add salt and black pepper. Reduce heat and let it simmer for about 20 minutes, or until the vegetables are soft.

Caramelized Onions

Cook Onions

In a skillet, melt 1 tablespoon of butter over medium heat. Add thinly sliced onions and cook, stirring frequently, until they are golden brown, about 15-20 minutes.

Grilled Cheese Preparation

Assemble Sandwich

Spread butter on one side of each slice of bread. On the unbuttered side, layer provolone cheese and a generous amount of caramelized onions. Top with another slice of bread, buttered side out.

Grill Sandwich

Heat a skillet over medium heat. Place the sandwich in the skillet and grill until golden brown, about 3-4 minutes on each side, until the cheese is melted.

Chimichurri Preparation

Mix Ingredients

In a bowl, combine parsley, minced garlic, red wine vinegar, olive oil, red pepper flakes, and salt. Mix well and let it sit for at least 10 minutes before serving.