How to Make It
Melt butter in a Dutch oven over medium-low heat. Add garlic cloves, onion, potato, and thyme. Cover and cook 25 minutes, stirring occasionally.
Add stock, water, salt, and 2-inch strip of lemon rind. Bring to a simmer; cover and cook at low 20 minutes or until very tender. Discard rind.
Add bread. Stir with a wooden spoon, scraping bottom of pan.
Pour half of soup in a blender. Remove center piece of blender lid (to allow steam to escape); secure lid on blender. Drape a clean towel over opening in lid (to avoid splatters). Blend until smooth; pour into a large bowl. Repeat with remaining soup. Return pureed soup to pan.
Stir in buttermilk; heat over medium-high heat until very hot (do not boil). Stir in sherry. Top soup with a mixture of toasted breadcrumbs, grated pecorino Romano, parsley, and lemon rind.
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