Preheat the oven to 200°C (400°F).
In a large bowl, mix peaches, raspberries, and blackberries with brown sugar, vanilla, cinnamon, lemon zest, and lemon juice.
Spread the mixture onto a sheet pan.
Roast for about 20 minutes until the fruit is soft and bubbling.
Remove from the oven and let cool slightly.
In a bowl, whisk together ricotta, honey, and vanilla until smooth.
To serve, add a dollop of sweet ricotta to a plate, top with roasted fruit and juices, and sprinkle with crushed hazelnuts.