Potato Croquetas with Saffron Alioli

Name: Potato Croquetas with Saffron Alioli
Ingredients: 1 pound large boiling potatoes (about 2); 3 large eggs; 1 tablespoon chopped fresh flat-leaf parsley; 1 tablespoon finely chopped fresh chives; 1/4 teaspoon chopped fresh tarragon; 2 tablespoons unsalted butter, softened; 1/2 teaspoon salt; 1/8 teaspoon black pepper; 3/4 cup all-purpose flour; 3/4 cup fine dry bread crumbs; About 4 cups olive oil (not extra-virgin) for frying; Accompaniment: saffron alioli; a potato ricer; a deep-fat thermometer