Pistachio Paste Prep: If needed, add salt to the pistachio paste, adjusting to taste. Make sure it has a strong pistachio flavor but it's not too salty.
1/4 tsp salt, 2 oz pistachio paste
Yolk Separation: Separate egg yolks from whites and set them aside.
2 egg yolks
Milk Reserve: Measure and set aside 1/2 cup of milk in an easy-to-pour container.
Pot Preparation: In a pot, mix remaining milk, egg yolks, sugar, white chocolate, and pistachio paste. Heat until nearly boiling while stirring often.
2 cups milk, 1 tablespoon sugar, 2 oz white chocolate
Starch Slurry: Mix starch with reserved milk until smooth, ensuring no lumps.
4 tablespoons cornstarch
Slurry Addition: When the pot mixture starts to bubble lightly, reduce heat to low and stir in the starch slurry. Stir continuously over low heat until thickened (about 1 minute).
Flavor Adjustment: Taste and adjust the pudding's flavor with sugar or salt as needed.
Portioning: Remove from heat and immediately portion the warm pudding into serving dishes.
Serve