Roasting concentrates the strawberries into an intense purée, swirled through a smooth, scoopable cream-cheese-and-cornstarch base with a tangy hit of buttermilk. No egg custard required.
Combine the strawberries and 1/3 cup sugar in an 8-inch square baking dish and roast in a preheated 375°F (190°C) oven until softened, about 8 minutes. Purée the berries in a blender or food processor with the lemon juice.
Mix 2 tbsp of the milk with the cornstarch in a small bowl until dissolved. Set aside.
In a medium bowl, whisk the cream cheese and salt until smooth. Set aside. Fill a large bowl with ice water and set aside.
Combine the remaining milk, cream, 2/3 cup sugar, and corn syrup in a large saucepan. Bring to a boil over medium-high heat and boil for 4 minutes. Remove from heat and slowly whisk in the cornstarch mixture. Return to medium-high heat and cook, whisking, until slightly thickened, about 1 minute. Remove from heat.
Gradually whisk the hot milk mixture into the cream cheese until smooth. Add the strawberry purée and buttermilk and blend well. Pour into a 1-gallon freezer bag, seal, and submerge in the ice bath. Let stand, adding more ice as it melts, until completely chilled, about 30 minutes.
Pour the base into a frozen ice cream maker canister and process until thick and creamy. Pack into a storage container and freeze until firm, at least 4 hours. Remove from the freezer 10 minutes before serving to soften slightly.
Notes
Why roast the berries: Roasting concentrates their flavour and drives off water, so the ice cream tastes intensely of strawberry without turning icy.The base: Cream cheese and cornstarch (a Jeni's-style base) replace egg yolks for a dense, smooth, scoopable texture.Plan ahead: The base needs about 30 minutes in an ice bath, then at least 4 hours in the freezer after churning.Equipment: An ice cream maker canister is required for this recipe.