Preheat your oven to 190°C (375°F).
Line a baking sheet with parchment paper.
Toss the strawberries with sugar, lemon juice, and salt directly on the sheet.
350 g fresh strawberries, 30 g granulated sugar, 1 1/2 tsp lemon juice, 1 pinch of fine sea salt
Roast for 25–30 minutes, stirring once, until the berries are soft, bubbling, and just starting to caramelize.
Let roasted strawberries cool slightly.
Blend to your preferred texture: Leave a little chunky for texture, or blend until smooth and strain out seeds for a silkier swirl.
You should yield about 275–300 g of purée.
Store in an airtight container in the fridge for up to 5 days, or freeze for later use.