Place blackberries in a bowl and use the back of a spoon to macerate until only slightly chunky.
Smear each bread slice with ricotta cheese. Add two or three small pieces of prosciutto, then spoon macerated blackberries over the top. Next drizzle with balsamic glaze and sprinkle with salt. Lastly place a leaf or two of fresh mint on each bread slice
These can be served right away or cover and placed in refrigerator, up to overnight.