The protein cooking time listed in this recipe has been updated.
As of December 2025, we’ve revised cooking times for all our proteins to reflect improved food safety guidance.
Check out the latest recommended times in our Cooking Guidelines.
Hoisin Yellowfin Tuna Traybake with Miso Sweet Potato
Sweet potatoes roasted in miso and maple syrup. Sustainably-sourced tuna steaks in sticky hoisin sauce. Pak choi, kale and mangetout for fresh, green goodness. The best part? It's all in one tray!
Prep in 10
High protein
4 of 5 a day
Low sat fat
Serving size
Ingredients
- 80g mangetout
- 1 unwaxed lime
- 160g sliced kale
- 1 onion
- 2 tsp black sesame seeds (Sesame)
- 2 pak choi
- 6 tbsp hoisin sauce (Soya) (Water, Miso Paste (Water, Soybeans, Rice, Salt), Date Syrup, Soy Sauce (Water, Soybeans Salt, Rice, Ethyl alcohol), Tomato Paste, Cornflour, Salt, Garlic, Acidity Regulator: Acetic Acid, Chinese Five Spice (Fennel Seed, Cassia, Black Pepper, Star Anise, Cloves), Cayenne Pepper)
- 2 sweet potato
- 1 tbsp white miso paste (Soya) (White Miso (Water, SOYBEANS, Rice, Salt), Water)
- 4 wild-caught yellow fin tuna steaks (Fish)
- 1 tbsp maple syrup
Nutritional Information
Calories: 459
Protein: 40g
Carbs: 52g
Fat: 12g
Hoisin Yellowfin Tuna Traybake with Miso Sweet Potato
Sweet potatoes roasted in miso and maple syrup. Sustainably-sourced tuna steaks in sticky hoisin sauce. Pak choi, kale and mangetout for fresh, green goodness. The best part? It's all in one tray!
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Cooking Instructions
- Preheat the oven to 240C / fan 220C / gas mark 9. Cut the sweet potato into wedges. In a large bowl, mix the miso paste together with the maple syrup, 1 tbsp oil and a good pinch of sea salt. Add the wedges and toss to coat. Place onto a lined baking tray and roast for 20-25 mins, until soft and golden.
- Meanwhile, thinly slice the onion and halve the lime. Place the onion into a small bowl and squeeze over the lime juice. Add a pinch of sea salt, mix together, then set aside to pickle.
- Quarter the pak choi. After the sweet potato has been cooking for 10 mins, add the pak choi, kale and mangetout to a large baking dish. Drizzle with 1 tbsp oil, a pinch of sea salt and black pepper. Roast for 5-7 mins, until the veg is beginning to soften.
- Coat the tuna steaks in the hoisin sauce. Place the fish on top of the veg in the baking dish, then return to the oven for a final 8-10 mins, until the veg and tuna steaks are cooked.
- To serve, mix the sweet potato and roasted veg together and serve on plates with the tuna on top. Sprinkle over the sesame seeds and finish with the pickled onion.
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