Pablo Alberto Galiano pointed out on
his blog that it is possible to spawn a recipe from a contextual menu... in the text editor!
I found pretty awesome that Recipes could be used out of the Solution Explorer. Just add :
<CommandBar Guid="d309f791-903f-11d0-9efc-00a0c911004f" ID="1037" />
...to the Recipe's host data. It really works!
Edit : Although I have no idea what the type of "DteHelper.GetTarget(dte)" is in that context. And because of the COM layer, I can't seem to find it by watching the variable or using GetType (I get generic COM wrapper objects).