Preheat your oven to 300°F. Line a baking sheet with parchment paper. (I've learned the hard way that skipping the parchment means scrubbing the pan until midnight. Don't be like past-me.)
Toss those gorgeous strawberries with 1/4 cup sugar and that tablespoon of balsamic vinegar. Spread them out on your baking sheet in one even layer – give them space to breathe and release their juices.
Roast for about 30 minutes. Your kitchen will smell like summer heaven, and the berries will turn darker, softer, and release their juices. This is where the magic begins.
Transfer everything – berries and all those precious juices – to a bowl and mash them until only small pieces remain. Think rustic, not completely smooth. Cover and chill for about an hour. Quick tip: If your day is running away from you, these roasted berries can hang out in the fridge for up to 3 days, making this a perfect prep-ahead recipe for busy moms