Sea salt
1 10-ounce bag of spinach, stems removed
1 10-ounce bag of arugula
1 tablespoon unsalted butter
2 tablespoons minced onion
1 clove hard-neck garlic - minced
2 teaspoons all-purpose flour
1-1/4 cups whole milk
1/2 teaspoon fresh lemon juice
1-1/4 cups grated Parmigiano-Reggiano
1/4 cup sour cream - plus more for serving
1/4 cup bacon jam
1/2 cup shredded white sharp cheddar cheese
1/2 cup artichoke hearts - squeezed dry and finely chopped
tortilla chips and salsa for serving