Heat 3 tablespoons of water in microwave for about 30 seconds. Dissolve the green tea powder into the water.
In a small bowl, reserve 2-3 tablespoons of the milk. Add the corn starch and whisk until smooth.
In a small saucepan, heat the almond milk, milk and half & half, sugar and honey over medium low heat stirring constantly for 4-5 minutes, just to a simmer. Add the corn starch slurry and continue to slowly simmer for another 3-4 minutes to thicken. Add the green tea mixture. Remove from heat.
Stir in the almond extract and 2 pinches of salt. Transfer the mixture into a container and refrigerate for several hours.
Freeze using an ice-cream maker according to manufacturer directions, and then continue to freeze in the freezer. This is best served while soft-serve. Top with toasted almonds if desired.