How do you make a classic recipe like fish tartare more sustainable? Look to Arctic char from northern Canada. To up the ante even further: salty, caviar-like mullet roe (another feel-good, sustainably sourced seafood), a double dose of citrus (lemon and orange zest), a touch of spicy sambal oelek and finely sliced shallot and chive. We recommend you use the best olive oil you can afford to add a little finesse to what is ultimately a fuss-free recipe. Served with a fresh green salad and croutons, this is an elegant meal for two.