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MR23 suggested soaking beans in hot water overnight, then using fresh water and cooking them until very tender. They will firm up when adding sugar; and you need to add at least the same weight of sugar as beans.
Then add 切り餅, which you can broil under the grill
Serve this with something salty, like 大徳寺なっと or salted sea weed
Instead of using a pair of chopsticks, use one くろもじ and a helper,
利休-shaped helper chopstick; because conceptionally, it's a sweet and not 懐石.
In that case, add the pair like you would in 懐石 resting on the R rim of the tray
However, you can also just put one 黒文字 on top of the lidded bowl
In either case, the tray is served just like the normal 懐石 tray, with the guest leaning a bit forward to receive it.
KS23 said that あわぜんさい is more common, which is cooked milled mixed with little 餅 pieces and with a drop of liquefied あん. I didn't think it looked particularly great; and while she argues it's more traditional for CNY, I think I prefer the soup.