Step 1

Prepare a baking sheet and line it with parchment paper or lighly butter it.

Step 2

Prepare the baking soda, vanilla and butter so you are ready when it's the time to use them.

Step 3

In a medium sized saucepan over medium high heat, bring the water, glucose, sugar, salt, and macadamia to a boil, stirring constantly with a wooden spoon or heatproof spatula. The macadamia will roast in the process.

Step 4

Cover with a lid for a minute to dissolve any sugar crystals.

Step 5

Remove the lid and cook, stirring occasionally, until it reaches 147 °C (296 degrees F). You have to use a thermometer here, making sure it doesn't touch the bottom of the pan.

Step 6

Remove from the heat, add in the prepared vanilla, butter and baking soda and stir for a few seconds, until everything is well combined. The mixture will puff up.

Step 7

Then immediately pour the brittle onto the prepared pan. Strech it with two forks, gently pulling in opposite directions making sure the macadamia nuts are not over each other.

Step 8

Only start making the ice cream when the brittle is cooled completely, about 1 hour.

Step 9

When the brittle is cooled completely, crush or chop it into small pieces. The smaller they are the easier is to eat the ice cream but don't turn them into dust.

Step 10

Prepare an ice cream container or a loaf tin 30x10 cm (12x4 inches).

Step 11

Start making the ice cream by whipping the cream to soft peaks (the cream holds its shape but lightly) in one bowl and mixing the condensed milk with vanilla extract and alcohol in another bowl.

Step 12

Stir 1/3 of the cream into the condensed milk and then gently fold in the remaining cream and crushed brittle pieces. You can leave some brittle to sprinkle over the top of the ice cream.

Step 13

Pour the ice cream into the prepared container, sprinkle over the remaining brittle and cover with a cling film to protect it from freezer odors and crystalization. Also cover with a lid, if you have it.

Step 14

Place the ice cream into the freezer for at least 8 hours or overnight.

Step 15

Leave the ice cream outside for two minutes before scooping for easier scooping. Enjoy!