1. Slice the Onions: Peel and thinly slice the onions into rings. Separate the rings and place them in a bowl.

2. Soak in Milk: Pour the buttermilk over the sliced onions, ensuring they are well coated. Let them soak for at least 30 minutes, or up to 2 hours if time allows.

3. Prepare the Coating: In a separate bowl, combine the all-purpose flour, salt, black pepper, and paprika. Mix well to create the coating mixture.

4. Coat the Onions: Heat vegetable oil in a deep fryer or a large, deep skillet to 350°F (175°C).

Take each soaked onion ring, allowing excess milk to drip off, and coat it in the flour mixture. Ensure the onion is evenly coated.

5. Fry the Onions: Carefully place the coated onion rings into the hot oil, a few at a time. Fry until golden brown and crispy, usually 2-3 minutes per batch.

6. Drain and Repeat: Use a slotted spoon to remove the fried onions and place them on a paper towel-lined plate to drain excess oil. Repeat the process until all onions are fried.

7. Season and Serve: While the fried onions are still warm, sprinkle them with a little extra salt if desired. Use these crispy French Fried Onions as a topping for salads, casseroles, burgers, or any dish that could use a crunchy and flavorful garnish.

Enjoy your homemade French Fried Onions!