Place strawberries in a baking dish with lemon juice and stir to coat. Roast 25-30 minutes. Remove form oven and let cool before mashing with a potato masher.
In a mixing bowl, whisk milk, half and half, sugar, and vanilla beans. Stir in cooled strawberries.
Pour mixture into bowl of an ice cream maker and follow manufacturer's instructions to churn.
How to make roasted strawberry ice cream