Sweet and Sour Tuna over Mixed Greens with Roast Asparagus

5 from 1 vote

Sweet and Sour Tuna over Mixed Greens with Roast Asparagus

Sicilian dishes like this often feature a balance of sweet and sour and this one is no exception. I like to serve this on top of a bed of mixed greens and spinach along with some roasted asparagus.

Course Main Course

Cuisine Italian

Keyword asparagus, dairy-free, dinner, egg-free, fish, italian, lunch, main, nightshade-free, nut-free, onion, salad, seafood, tuna, vinegar

Prep Time 10

Cook Time 40

Total Time 50

Servings

Calories 333kcal

Author Jenny Ross

Ingredients

Tuna:

1 tablespoon avocado oil or more traditionally, olive oil
2 yellow onions diced
1 1/3 pounds tuna steaks 4 steaks
1 cup red wine vinegar
1/2 teaspoon stevia glycerite or 1/3 cup allulose
1/16 teaspoon glucomann powder optional (helps thicken)
salt and pepper to taste

To Serve:

4 cups spinach
4 cups mixed greens or more spinach
1 pound asparagus trimmed
1/2 tablespoon avocado oil
salt to taste

Get Recipe Ingredients

Instructions

Add 1/2 tablespoon avocado oil and the onion to a large nonstick pan and cook, stirring occasionally over medium heat until soft and translucent, about 5 minutes. Continue cooking, stirring often until deeply caramelized (you will need to stir more often as they darken). Add water if anything gets very dark or browns unevenly, another 20 minutes or so. Remove from pan and set aside. Do not clean the pan.
Add the vinegar and sweetener and cook until reduced by half and thickened, about 5 minutes. Stir in the onions and then transfer the sauce to a bowl and reserve. Wipe the pan clean.
Season the tuna with salt, to taste and rub it with the remaining avocado oil. Heat the pan over medium-high heat. When hot, add the tuna and sear until just seared, about 30-60 seconds, flip and cook the second side another 30-60 seconds. I prefer the interior of the tuna to be raw but heated through but you can cook it longer if you prefer the fish to be more thoroughly cooked. Simply add the sauce to the pan with the tuna and simmer until the interior is cooked to your liking when tested with a knife.
To serve, place tuna on serving plates and spoon reserved sauce over top.

Nutrition