Cooking crisis... Need advice now! Can I substitute tomato sauce for tomato paste +...

[kathy_is_a_nurse]

...Cornstarch? Making a veggie side dish that calls for tomato paste... All I have is tomato sauce. Will the cornstarch be an adequate thickener that the paste would normally provide? How would you suggest I modify the measurements... since the sauce is thinner than the paste?

Thanks!