Toss grapes with salt, pepper, 1 Tbsp olive oil, and rosemary leaves. Place them on a rimmed baking sheet and bake at 450 degrees F for 10 to 15 minutes, until skins begin to burst open. Take out grapes and leave the oven turned on.
Rub 1 Tbsp of olive oil onto your pizza dough and sprinkle with a pinch of salt.
Spread on the ricotta then sprinkle on the other cheeses.
Transfer roasted grapes onto the pizza, being careful not to transfer excess cooking liquid onto the pizza.
Bake pizza on middle rack at 450 degrees F for about 10 minutes, or until it begins to lightly brown. Transfer to the top rack and broil for 1 minute, watching carefully, until cheese is brown and bubbling.
Recipe by at https://www.ideahacks.com/roasted-grape-pizza/