Mix diced strawberries with ½ cup sugar in a bowl and let sit at room temperature for 30 minutes. Mash with a fork, leaving some chunks for texture.
Split the vanilla bean, scrape out seeds, and add them, along with the pod, to a saucepan with heavy cream and milk. Heat until simmering (don’t let it boil), then remove from heat and steep for 15 minutes.
Whisk egg yolks with ½ cup sugar. Gradually add the warm cream mixture, whisking constantly to avoid curdling.
Pour the egg-cream mixture back into the saucepan. Cook on low heat, stirring constantly, until the custard thickens enough to coat the back of a spoon (about 5-7 minutes). Don’t let it boil.
Remove from heat, stir in vanilla extract, and let the custard cool. Once cooled, fold in the mashed strawberries and juice.
Pour the mixture into an ice cream maker and churn according to the manufacturer’s instructions (about 20-25 minutes).
Transfer the ice cream to an airtight container and freeze for at least 4 hours, or until firm.