If too much water (from cauliflower) is an issue, why cook it in additional liquid? Why not oven-bake cauliflower? Or cook it in the buttermilk? W...

Cooking in buttermilk might scorch your pan; I think it cooks it in broth to add flavor. However, I think roasted cauliflower would be delicious in this! You could probably roast the florets with some salt and olive oil in the oven at the same time the bacon is cooking. It specifies one-inch pieces so couscous size might be too small.