Roasted Pumpkin with seasoning

1 2/3 lbs pumpkin , peeled, cut into chunks 6 large tomatoes , halved 1 onion , thickly sliced 4 -5 garlic cloves , peeled 4 fresh rosemary sprigs 4[...]

9 tablespoons unsalted butter (1 stick plus 1 tbsp.) 1 small pumpkin , cut in half and deseeded 1 yellow onion , peeled and halved kosher salt and freshly[...]