A FEW THINGS YOU'LL WANT TO KNOW
Can I use a different fish instead of tuna?
Yes — we've made it with kingfish and it's lovely. That said, I really do feel tuna goes so well with this dressing, so it's my first pick every time.
I don't have mirin — what can I use?
Rice wine vinegar works as a substitute. Just add 2 teaspoons of sugar along with the 2 tablespoons of rice wine vinegar to balance it out.
I'm not a fan of wasabi — can I leave it out?
If you don't love wasabi, just go with half a teaspoon. I've left it out before too, but I do think the wasabi makes it.
Can I make this ahead for entertaining?
Mostly, yes — and that's why it's such a good entertaining recipe. Make the dressing with the spring onion and set it aside, have your bread toasted (left uncovered so it stays crisp), and keep everything else ready to go. Then just toss the tuna, sesame seeds and avocado through at the last minute and serve.
How do I stop the avocado going brown?
Dice it right before serving. If you need to prep it earlier, coat the pieces in a little lemon juice and it'll hold its colour.
How much tuna is 500 grams?
It's usually about two tuna fillets. And if you're a little under or over — say 550 or even 600 grams — that's completely fine. The dressing is generous, so it stretches easily.
How do I know the tuna is fresh enough to eat raw?
You need sashimi-grade tuna for this recipe, since it's served raw. Ask at the fish counter — a good fishmonger will tell you exactly which tuna is sashimi grade. You're looking for flesh that's deep red and glossy, with a clean, fresh smell — never fishy. If you're not sure, just ask. It really does make all the difference here.