Part 1: Make the Crème Anglaise (Vanilla Custard Sauce)

This sauce needs to chill completely, so it’s best to make it first.

1. Infuse the Milk/Cream: In a medium, heavy-bottomed saucepan, combine the whole milk, heavy cream, and the split vanilla bean (both pod and scraped seeds). If using vanilla extract, wait to add it later.
2. Heat Gently: Place the saucepan over medium-low heat. Bring the mixture just to a simmer – watch for small bubbles forming around the edge of the pan. Do not let it boil vigorously. Once simmering, remove from heat, cover the pan, and let the vanilla infuse for 15-20 minutes to develop a deep flavor.
3. Prepare the Yolks: While the milk mixture is infusing, whisk the egg yolks, 1/2 cup (100g) granulated sugar, and the pinch of salt together in a medium bowl until pale yellow and slightly thickened. Whisking well at this stage helps prevent the yolks from scrambling later.
4. Temper the Eggs: Remove the vanilla pod from the warm milk mixture (you can rinse it, dry it, and store it in sugar to make vanilla sugar later). Now, very slowly, pour about half a cup of the warm milk mixture into the egg yolk mixture while whisking constantly. This is called tempering – it gently raises the temperature of the yolks so they don’t cook immediately when added to the hot liquid.
5. Combine Mixtures: Once the first addition is whisked in, continue to slowly pour the remaining warm milk mixture into the tempered yolk mixture, whisking continuously until fully combined.
6. Cook the Custard: Pour the entire mixture back into the heavy-bottomed saucepan. Place it over low heat. Cook, stirring constantly and scraping the bottom and sides of the pan with a wooden spoon or heatproof spatula. This is the crucial stage – do not let the custard boil, or it will curdle. The temperature should ideally stay between 170°F and 180°F (77°C – 82°C).
7. Check for Thickness: Continue cooking and stirring until the custard thickens enough to coat the back of the spoon (nappe consistency). You should be able to draw a clean line through the custard on the back of the spoon with your finger, and the line should hold. This typically takes 5-10 minutes, depending on your heat.
8. Strain and Chill: Immediately remove the saucepan from the heat once thickened. Pour the crème anglaise through a fine-mesh sieve into a clean bowl. This removes any potential small bits of cooked egg or the vanilla pod fragments and ensures a silky smooth texture. If using vanilla extract instead of a bean, stir it in now.
9. Cool Down: Place a piece of plastic wrap directly onto the surface of the custard (this prevents a skin from forming). Let it cool to room temperature, then refrigerate until completely chilled – at least 2-3 hours, or preferably overnight.

Part 2: Make the Meringues (The “Islands”)

Ensure your mixing bowl and whisk are impeccably clean and free of any grease, which can prevent the egg whites from whipping properly.

1. Prepare Poaching Liquid: Pour the 4 cups of milk (or milk/water mixture) into a wide, deep skillet or sauté pan. The liquid should be about 1.5 inches deep. Heat over medium-low heat until it reaches a gentle simmer (around 180°F or 82°C). Do not let it boil.
2. Whip the Egg Whites: In the clean bowl of a stand mixer fitted with the whisk attachment (or using a large bowl and electric hand mixer), beat the room temperature egg whites on medium-low speed until foamy.
3. Add Stabilizer: Add the cream of tartar (if using) and continue beating until soft peaks form (the peaks droop when the whisk is lifted).
4. Gradually Add Sugar: Increase the mixer speed to medium-high. Start adding the 3/4 cup (150g) granulated sugar very slowly, about a tablespoon at a time, while the mixer is running. Allow the sugar to incorporate fully before adding the next spoonful. This process helps dissolve the sugar and creates a stable, glossy meringue.
5. Beat to Stiff Peaks: Continue beating until the meringue is thick, glossy, and holds stiff, upright peaks when the whisk is lifted. Be careful not to overbeat, which can cause the meringue to become dry and grainy. Gently fold in the 1/2 teaspoon of vanilla extract.
6. Shape the Meringues: Using two large spoons, scoop generous quenelles (oval shapes) of the meringue mixture. Alternatively, use a large ice cream scoop for rounder shapes. Gently drop the meringue clouds onto the surface of the simmering milk. Don’t overcrowd the pan; work in batches if necessary.
7. Poach Gently: Reduce the heat to low to maintain a very gentle simmer (no bubbling). Poach the meringues for about 2-4 minutes per side. Carefully flip them using a slotted spoon or spatula. They should puff up and feel slightly firm to a gentle touch but still be delicate. They will continue to firm up slightly as they cool.
8. Drain and Cool: Using a slotted spoon, carefully lift the poached meringues out of the milk. Let any excess milk drip off. Place them on a wire rack set over a baking sheet lined with paper towels to cool completely. Repeat with the remaining meringue mixture. The poaching liquid can be strained and potentially reused in other recipes or discarded.

Part 3: Make the Caramel

Caramel can be tricky and requires your full attention. Be extremely careful as hot sugar can cause severe burns.

1. Combine Ingredients: In a small, heavy-bottomed saucepan, combine the 1 cup (200g) granulated sugar, 1/4 cup (60ml) water, and the teaspoon of light corn syrup or lemon juice (if using). Stir gently just to combine – try not to splash sugar crystals onto the sides of the pan.
2. Cook the Sugar: Place the saucepan over medium-high heat. Bring the mixture to a boil without stirring. If you see sugar crystals forming on the sides, use a wet pastry brush to gently wash them down into the syrup.
3. Watch the Color: Let the syrup boil undisturbed. It will turn clear, then slowly start to color. Watch it very closely. Swirl the pan gently occasionally (do not stir) to ensure even cooking.
4. Reach Amber Color: Continue cooking until the syrup turns a beautiful medium amber color. The exact color depends on preference – lighter caramel is sweeter, darker caramel has a more pronounced bitterness. This can happen quickly, so don’t walk away! It typically takes 5-8 minutes.
5. Stop the Cooking: As soon as the desired color is reached, immediately remove the pan from the heat. You can dip the bottom of the pan into an ice bath for a few seconds to halt the cooking process instantly if needed, preventing it from getting too dark.
6. Use Immediately (or Reheat): Caramel hardens quickly as it cools. It’s best used immediately for drizzling. If it hardens too much, you can gently reheat it over very low heat until liquid again, but be careful not to burn it.

Part 4: Assemble the Floating Islands

1. Prepare Bowls: Choose shallow, wide bowls or coupe glasses for serving.
2. Add Custard: Pour a generous pool of the well-chilled crème anglaise into the bottom of each bowl.
3. Float the Island: Carefully place one or two cooled poached meringues on top of the crème anglaise in each bowl.
4. Drizzle with Caramel: Using a fork or spoon, drizzle the warm caramel decoratively over the meringues and custard. You can create thin threads or a more generous lattice pattern. Work quickly before the caramel hardens.
5. Garnish (Optional): Sprinkle with toasted sliced almonds for crunch, or add a few fresh berries or a mint sprig for color and freshness.
6. Serve: Serve immediately to enjoy the contrast of textures and temperatures (cool custard, room temp/cool meringue, warmish/hardening caramel).