Croquetas de jamon recipe

Ingredients

• 150 g butter
• 1 x quarter of a Spanish onion
• 150 g plain flour
• 1 pinch white pepper
• 1 pinch nutmeg
• 1.2 l whole milk
• 1 tsp salt
• 100 g jamon Serrano
• 2 eggs
• 100 g breadcrumbs
• 1 l oil for frying, approx