Can you substitute yuzu juice for the juice from the Seville oranges in the Bitter Orange Tart?
Nigella's Bitter Orange Tart (from SIMPLY NIGELLA) has a gingernut (ginger snap) crumb base that is filled with a Seville orange curd. Seville oranges are sharp and slightly bitter and are only in season from December to February. But if you don't have Seville oranges you can use a mixture of limes and regular oranges instead.
Yuzu is sharp citrus fruit that is popular in Asia. We suspect that you could use yuzu, though it is an expensive alternative. Yuzu can have thick skins, so you may need more than 4 fruits to get 200ml (¾ cup plus 1 tablespoon) of juice. However, we would mention that as we have not tried the tart with yuzu the sweet-tart balance many not be quite right and our preference would be to use the orange and lime alternative mentioned in the recipe introduction. If you are using bottled yuzu juice then make sure that it is pure yuzu juice and we would suggest adding the finely grated zest from 2 oranges to the curd.