In a large stock pot, bring 4 ½ cups of water to a boil over medium-high heat.
Once boiling, stir in Alessi Sicilian Lentil Soup mix. Cook soup on medium heat uncovered for 12 minutes, stirring occasionally.
Meanwhile, combine mayo, garlic puree, sea salt, black pepper and lemon juice in a small bowl. Whisk and season to taste.
In a cast iron pan, melt 1 tablespoon of butter over medium heat. Add two slices of bread, face down and toast until golden. Flip over and cook on other side of bread. Remove from heat and smear seasoned mayo on the inside of both pieces of bread.
Build the sandwich by layering prosciutto, mozzarella and arugula in between slices of toasted focaccia.
When ready, ladle the soup into a bowl and serve with the sandwich. Mangia!