1. Caramelize: Let the mixture cook without stirring. Swirl the pan occasionally to ensure even caramelization. After about 7-10 minutes, the sugar will turn a deep golden amber color.
2. Pour immediately: Once the caramel reaches a rich golden brown, quickly pour it into the arro mold. Swirl the mold to coat the bottom evenly before the caramel hardens.

Step 2: Making the Flan Custard

1. Preheat oven: Set the oven to 325°F (163°C) and place a large roasting pan inside. This will be used for the water bath.
2. Whisk eggs: In a large mixing bowl, whisk 4 eggs and 2 egg yolks until well combined.
3. Add dairy: Slowly whisk in sweetened condensed milk, evaporated milk, and whole milk until smooth.
4. Incorporate sugar, vanilla, and salt: Add 1/2 cup sugar, vanilla extract, and a pinch of salt. Mix until fully blended.
5. Strain for smoothness (optional): Pour the mixture through a fine-mesh strainer to remove any egg bits, ensuring a perfectly smooth flan.
6. Pour into mold: Gently pour the custard mixture over the hardened caramel in the arro mold.

Step 3: Baking the Flan

1. Prepare the water bath: Place the arro mold inside the preheated roasting pan. Pour hot water into the roasting pan until it reaches halfway up the sides of the mold. This water bath prevents the flan from curdling.
2. Cover and bake: Loosely cover the mold with aluminum foil. Bake for 55-65 minutes, or until the flan is set but slightly jiggly in the center.
3. Cool and chill: Carefully remove the mold from the water bath and let it cool at room temperature for 1 hour. Then, refrigerate for at least 4 hours (preferably overnight) to allow flavors to meld and texture to set.

Step 4: Unmolding and Serving

1. Loosen the edges: Run a knife around the edges of the flan to loosen it from the mold.
2. Invert onto a plate: Place a serving plate over the mold and carefully flip it upside down. The caramel will drizzle over the flan.
3. Slice and serve: Cut into slices and enjoy this rich and creamy dessert!

Recipe Variations:

• Coconut Flan: Substitute half the whole milk with coconut milk for a tropical twist.
• Coffee Flan: Add 1 tablespoon espresso powder to the custard mixture for a subtle coffee flavor.
• Chocolate Flan: Melt 4 ounces of dark chocolate and mix it into the custard for a decadent twist.
• Spiced Flan: Add 1/2 teaspoon cinnamon and 1/4 teaspoon nutmeg for a warm, spiced version.