Savoury ancient grain porridge recipe

Name: Savoury ancient grain porridge recipe
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: Asian
Ingredients: Porridge base; 5.0cups water (approx. 1.2 litres); 0.33cup buckwheat (approx. 57 g); 0.33cup quinoa (approx. 57 g); 0.33cup brown rice (approx. 67 g); 0.33cup millet (approx. 67 g); 1.0tbsp ground flax seeds; Miso mushrooms with bok choy; 2.0tbsps miso paste; 2.0tbsps brown rice vinegar; 2.0tbsps tamari; 0.25tsp sesame oil, optional; 2.0tbsps olive oil; 6.0 mushrooms, portobellos or shiitake; 4.0 large bok choy, ends trimmed; To Serve; 1.0 avocado, sliced; 0.0 sesame seeds