Sashimi Salad (with homemade Japanese wafu dressing)

Name: Sashimi Salad (with homemade Japanese wafu dressing)
Prep time: 10 min
Cook time: 2 min
Total time: 12 min
Cuisine: Japanese
Ingredients: 1 tbsp soy sauce; 1 tbsp mirin; 1 tsp sugar; 1/2 tbsp white toasted sesame seeds; 1/2 tbsp toasted sesame oil; 1/2 tbsp olive oil; 1/2 tsp garlic paste; 1/2 tsp lemon juice; 1 pinch white pepper; 200 g sashimi-grade fish (salmon, tuna, red snapper etc sliced); 1 avocado (cubed); 100 g mini tomatoes (halved); 30 g baby leaf spinach; 150 g mixed lettuce leaves