From my mother who is from a little town in Italy near Rome. Must use fresh herbs! Do not saute garlic in oil- it will not taste the same. Garlic, parsley tomatoes oil need to cook slowly together! The idea of the whole cloves is that you don't have to eat them if you don't want to! I just leave them. And remember to cook this recipe SLowly. Lobster or crabs may be substituted for shrimp.