There are different types of treacle, Black is only one, Golden Syrup is a lighter-coloured type of treacle and often substituted with corn syrup in recipes where black treacle is not available. In Britain, the main producer of black treacle (and Golden Syrup) is sugar refining company Tate and Lyle.
Roasted grapes are sophisticated. Toss grapes with olive oil, salt, and pepper, and roast them on a sheet pan for about 30 minutes at 425Â°F. The grapes will get blistered and caramelized on the outside, and extra juicy and practically jammy on the inside.
For the best batch of organic grapes (Vitis), it is essential to pick the grapes when they are ripe. See below for ways you can test for ripeness. Tasting is the best test for maturity. If grapes are sweet and flavorful, they are ready to pick. The next best guide is color.