Salt
2 2/3 cups (11 ounces) ditalini or mezzi tubetti pasta
3 ounces (about 15 slices) Milano salami, scissored into strips
1 (14-ounce) can diced tomatoes, plus 1/2 can water
2 tablespoons butter
1 bouquet garni (mixed herb sachet or bag), optional
1 (15-ounce) can cannellini beans, drained and rinsed