To make Nomato Paste, use less water to cook down the veggies. More water will give you a Passata like consistency.
If your Nomato Sauce is too pink, add more steamed carrot or pumpkin.
To avoid you having to regularly cook Nomato Sauce, simply triple the recipe and then store/freeze it portioned out. I usually freeze it in 400g portions (same volume as tinned tomatoes).
To keep your hands from turning red, use a plastic glove clean your hands with a bicarb soda and lemon juice paste.
Substituting cooked tomatoes in a recipe is easy. When the tomato part of the recipe isn't the main ingredient (like in a curry), I have found that about 1/2 to 2/3 of Nomato Sauce instead of tinned tomatoes or tomato paste works well. When making Napoli sauce, pizza sauce or Nomato soup, use the paste 1:1.