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If it has bean paste (or another paste) in it, technically it's 羊羹. If it's clear, it's 錦玉羹.
蓮根羹
Recipe
The base recipe is:
This makes it a bit grainy from the lotus root pieces, which I guess some people appreciate. However, I prefer this way:
350 gr peeled lotus root. I used frozen ones, which are very nice and white. Unthaw, then blend with just enough water to purée. Squeeze, but catch the lotus juice. Retain about 100 gr of thoroughly squeezed lotus pulp.
180 gr lotus juice (instead of water)
4 gr powdered agar (the Migros' brand is 22% agar, so 20 gr of that)
150 gr sugar
Cook agar for 2' in juice, then add sugar and dissolve. Add pulp, bring to a boil. Sieve into 流し器. Add some thin layer of pulp on top. (Maybe you need to let it cool down a little bit before adding it so it doesn't sink down.)
錦玉羹
Of this, the oldest form is the 琥珀羹. It's amber coloured and quite stiff. It comes from Edo period, where the amber colour comes from the less refined sugar. It's the proto-水羊羹, so to speak. Nowadays, 亀屋良永 still makes it, for example; but you also see other makers add some candied beans to it. Not my favourite.