I'll preface this by saying I've never tried it, and it sounds like a PITA, and I'm paraphrasing, but here goes:
From a 28 oz can of whole tomatoes... Reserve all the liquid (up to 1.5c) , strain out the seeds, sprinkle the sliced tomatoes with 3/4 T brown sugar and bake at 450 for about 30 min on a foil lined pan, until dry and slightly changed in color.
Simmer 2 T butter, 1.5 t tomato paste, a minced shallot, and a pinch of allspice until shallots softened, about 7-10 min. Add 1 T flour, stir until thickened, 30 sec.
Combine all of the above - shallot mix, roasted tomatoes, liquid from can, with 3/4 c low salt chicken broth, whisk together and simmer low 10 min, stirring occasionally. Blend this in a blender or immersion until smooth. Add 1/4 c heavy cream, stir and bring to warm. Remove from heat, add 1 T sherry or brandy, salt and cayenne to taste.
I'll add again, this sounds like a PITA. I'd probably try the canned.