Heat the oil in a pan, add the garlic and mushrooms and cook over a medium-high heat for about 5-6 min, until browned. Add the miso, tamari, and water and stir through, cook about 1-2 minutes until slightly reduced and the mushrooms are coated with the sauce mixture. Chop the parsley, and toss it through the other ingredients in the pan.

To serve, top the toast with rocket, add the mushrooms, tomatoes and sprinkle over the sesame seeds.