Cuban Fritas with Matchstick Potatoes

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1 pound ground beef (80 percent lean)

1 pound chorizo, casing removed

1 teaspoon smoked paprika, plus more for seasoning fries 

Salt and pepper

1/4 cup evaporated milk 

1/4 cup panko 

1 egg, beaten 

1/2 cup mayonnaise

2 tablespoons lime juice 

2 tablespoons orange juice 

2 cloves garlic, minced 

1/4 cup guava paste 

2 tablespoons apple cider vinegar 

1 medium onion, sliced into half-moons 

2 tablespoons butter 

1/4 cup ketchup 

4 large potato buns, split 

2 russet potatoes, scrubbed 

Olive oil, for frying