This is a traditional French dish, and my good friend @tiara_star described this really well, I couldn't have done better. Here's her review:
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"Quenelle - a French rustic dish of a mixture of creamed fish/meat bound together lightly with egg and made into an egg-like shaped dumpling before poaching. Here, they use pike. 💫
The resulting texture is slightly spongy with a little spring when bitten into, like a most soft, slightly bouncy dumpling. Interesting, and I definitely took to this with the savouriness of the gratinee contrasted against the clean fish dumpling flavour, added with the crispness of breadcrumbs. The mushroom gratinee in almost-puree form provided that little touch of rich creaminess at the end.
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Not commonly found, even among French restos here. Found this, and a weeknight full of fun banter and laughter with fellow foodies."