Have made these for years, but prefer regular white or yellow onion sliced. For those complaining of them not being crispy and browning, I don't find anywhere that says they are supposed to be crispy. I don't pre-cook mine in the microwave. I cut them, skin and all, into thick French fry shapes, lay them out on heavy duty foil sprayed with cooking spray (I use a mister filled with olive oil), top with small chunks of butter, and sprinkle with salt and pepper. After sealing the packets tightly, I place them on the hot grill and flip about every 5 minutes, cooking a total of about 30 minutes (may take longer if making large packets). It is best to use a spatula/turner instead of tongs to flip the packets to reduce the chance of tearing the foil. With the butter in the packets and 30 minutes cooking time, there is some browning, but they will not be crispy-just great tasting.
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Have made these for years, but prefer regular white or yellow onion sliced. For those...