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1
Place the diced Speck in a large, heavy pot set over a medium flame. Render slowly, stirring occasionally, until the fat runs freely and the cubes colour at the edges. The fat in the base of the pot should be liquid and fragrant with smoke.
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2
Add the diced onion, carrot, and celery. Cook in the rendered Speck fat over a medium flame, stirring regularly, until the vegetables have softened and turned translucent, without taking on significant colour. The aromatics should be yielding and fragrant.
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3
Add the rinsed pearl barley and the dried porcini. Stir to coat every grain in the fat. Add the cold water or light broth to cover generously — approximately 2 litres. Bring to a simmer. The liquid should rise to a steady, gentle bubble.
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4
Add the diced potato, bay leaves, and Parmesan rind. This is where the dish lives or dies: maintain a gentle, uncovered simmer for the full 45 to 60 minutes, stirring occasionally to prevent the barley from settling and catching. The barley must cook until completely tender throughout and its starch has thickened the broth substantially — the spoon, drawn across the surface, must leave a clear trail that closes slowly. A soup that is thin or in which the barley retains any chalkiness is not ready.
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5
Remove and discard the bay leaves and Parmesan rind. Taste before adding any salt — the Speck's heavy cure may render additional salt unnecessary. Adjust seasoning with black pepper and, if required, a small measure of salt. The flavour should be smoky, savoury, and rounded.
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6
Ladle into wide, deep bowls. Finish each portion with a drizzle of raw extra-virgin olive oil and a scattering of chopped chives. The surface should carry a sheen of oil against the opaque, starch-thickened broth.