Almost-Famous Spinach-Artichoke Dip

INGREDIENTS

Kosher salt

bags spinach, stems removed

1 tbsp

unsalted butter

2 tbsp

minced onion

1 clove

garlic, minced

2 tsp

all-purpose flour

1 1/4 cups

whole milk

1/2 tsp

fresh lemon juice

1 tsp

Worcestershire sauce

1 1/4 cups

grated parmesan cheese

1/4 cup

sour cream, plus more for serving

1/2 cup

shredded white sharp cheddar cheese

1/2 cup

frozen artichoke hearts, thawed, squeezed dry and roughly chopped

Tortilla chips and salsa, for serving