Make well ahead of time, even days. Just make sure to keep tightly covered or sealed in plastic bag so no freezer flavors are absorbed.
- 1 jalapeno, halved lengthwise
- 1 cup whole milk
- 3/4 cup superfine sugar
- 2-inch piece ginger
- 2 cups heavy cream
- 1 teaspoon vanilla extract
Line a small loaf pan or other mold with plastic wrap, leaving some plastic wrap hanging over the edges.
Combine jalapeno, whole milk and 1/2 cup of the sugar in a saucepan and heat until steaming, stirring often. Remove milk from heat and let cool to room temperature.
Peel and grate ginger and squeeze the gratings to release ginger juice. Stir into milk mixture.
Transfer to prepared pan and freeze until set.
Remove semifreddo by pulling evenly on opposite ends of the plastic wrap lining.