Cut the zucchinis into thin slices with a vegetable peeler.
Add all the filling ingredients to a food processor and pulse until the texture is smooth and homogenous.
Pour ½ cup tomato sauce into a baking dish to make a thin layer on the bottom.
Lay the zucchini slices down on a cutting board. Brush each slice with a little tomato sauce, then spread about a teaspoon of the filling onto each slice.
Roll up the zucchini slices and place them in the baking dish, over the tomato sauce layer.
Repeat with all the remaining slices.
Bake the zucchini rollups for about 30 minutes.
Serve with some fresh herbs garnished on top.
Notes
Dilute the miso paste in an equal amount of water before adding it so it blends evenly, and don't overfill each slice - about a teaspoon of filling keeps the rolls easy to close.