Concord grapes are one of my favourite fruits (certainly my favourite type of grapes). This crumble's crumbs are a combination of whole wheat flour, rolled oats, brown sugar and cocoa, while the filling is kept as simple and "naked" as possible. I find the dark cocoa really pairs well with the sweetness and flavour of the concord grapes and with the spices in the filling, yielding a nutty, bitter-sweet finish that is very satisfying —Silvia Merler
In a medium bowl, mix well the grapes, honey, 2 tablespoon sugar and spices. Slightly grease a pan (I used a regular 9-inch pie plate) and pour the filling in it. I don't like adding thickeners (e.g. starch or flour) to the filling of pies or crumbles, because I find the thickener alters the flavour. Concord grapes are not the juiciest fruit either, so I found that this was not a problem in this particular case.
In a second bowl, mix the flours, oats, cocoa powder and sugar. Add the butter cut to pieces and mix with your fingers until you get a crumbly mixture in which the butter is uniformly distributed as possible in small bites.
Pour the crumble over the filling, being careful to uniformly cover the fruit. Bake in the oven for 30-35 minutes. Let it rest a bit before devouring.