Preheat the grill to moderate. Place the bread slices on the grill tray and lightly toast on both sides.
Mix together the tomato purée and tomato paste and spread a little of the mixture over each toast, covering the surface completely.
Slice the tomatoes lengthways, discarding a slim slice from the curved edges, to give 4 flat slices from each tomato. Lay a slice of tomato on top of each toast.
Place 1 small slice firm goats cheese or about 1 teaspoon soft goats cheese on top of each tomato slice, then drizzle with a little of the olive oil. Scatter a few pine nuts and herb sprigs over the top.
Grill for 4–5 minutes or until the cheese is beginning to melt and the pine nuts are golden. Serve the toasts hot.