Salted margarita bars

Name: Salted margarita bars
Prep time: 2 h
Cook time: 1 h
Total time: 3 h
Yield: 16 servings
Cuisine: American
Ingredients: 400 ml of Condensed milk; 120 gr of Cream crackers; 1 tsp of Fine sea salt; 4 Limes; 5 Medium egg; 2 tbsp of Orange liqueur; 60 ml of Tequila; 110 gr of Unsalted butter; 1 tbsp of White sugar