This is one of my favorite uses for slow-roasted tomatoes. The terrine isn't hard to assemble (use a disposable foil mini loaf pan), but it can be tricky to slice. I use an electric slicer. If you don't have one, try using dental floss to cut nice, even slices while the terrine is still very cold. You can also serve the terrine with bread or crackers, almost like a spread.