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When the internal temperature of the sausage reaches 100°F (38°C), increase the temperature setting to 150°F (66°C), then close the damper halfway.
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After the casings are brown, add a pan of dampened (not soaking) sawdust; close the damper so it is only one-quarter of the way open.
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When the amount of smoke from the damper decreases, add another pan of dampened sawdust. Repeat two or three times more, for a total of four or five times. Remove the pan completely when the sausage color is dark.
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If the sausages have not reached an internal temperature of 125°F (52°C) at this point, adjust the temperature setting of the smoker to 160°F (71°C) to 165°F (74°C) and continue to smoke the sausages until they reach 125°F (52°C).
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Continue to smoke the sausages until an internal temperature of 152°F (67°C) is reached. To reach the final internal temperature of the sausages, it may be necessary to fill the empty sawdust pan with boiling water and place it in the smoker.
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Remove the sausages from the smoker. Rinse with cool water, reducing the internal temperature to 100°F (38°C). Hang the sausages on wooden dowels to dry for 20 to 25 minutes; the sausages will darken – or bloom – as they dry.
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When completely cool, cover with wax paper and refrigerate. They will keep for up to 2 weeks, well wrapped. You can also place individually wrapped sausages in freezer bags and freeze until needed.