Baking – Can palmiers be refrigerated/frozen overnight

I would steam them, let them cool, then freeze them. If you buy them in large quantites from a vendor or from a fund raiser or something, they come already steamed.

As for prep, I would think the microwave is the best answer, as that ought to keep them nice and moist while they are cooking. Steaming them again would probably work, but might take a while. And while I haven't tried it, I suspect an oven might dry them out too much.

You can't drain them while they're frozen. If you need to use them quickly, consider thawing them in the microwave, then draining them.

As for how to drain them, it depends on the type of vegetable. Greens like spinach should be squeezed out. Chunky vegetables should be drained in a colander and then dried with a towel.

Some of the water you get may be coming from inside the vegetables, though, in which case it's still going to come out only when cooking. In that case, the only solution is not to overcrowd the pan.