Cook bacon in 1 TBSP. olive oil over med-high heat 'til it starts to render its fat. Add onion, carrot, celery & potatoes & cook, stirring, for 5 min. Add beans,tomatoes,broth,1 TBSP. rosemary & salt & pepper & cook 'til potatoes are tender, about 20 min.
Reserve 1 cup bean mixture & put the remainder through a food mill. Return all to pot, bring to a boil & add ditalini. Reduce heat to med. and cook 'til pasta is done, about10 min. Sprinkle with remaining rosemary.
Serve drizzled with olive oil and sprinkle some Parmesan cheese over it.