Leftover Cauliflower and Seitan, Carrot and Spinach atop Roll (No Added Fat)

I heated and served leftover cauliflower and seitan from this past Friday. We had some rolls and I thought I'd experiment with making a topping in the pressure cooker. I pressure cooked for 2 minutes under low pressure two grated carrots, 1/2 grated onion, 1/2 cup chopped spinach, and 1/4 cup water. I served that atop the roll.

The grated and pressure cooked vegetables were good. I'd like to take this approach and create a layered meal, such as a lasagne.