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Turn the stove on to medium-high heat and allow the water to simmer. It will take between 6 to 8 minutes for the water to come to a simmer. Allowing the water to simmer will cook your sausages all the way through and keep them tender. The sausages will still look gray on the outside, but will have no pink tint on the inside. Any juices from the sausage will be clear. Turn the burner to high heat and allow the oil to gently simmer. They will not need to sit in the oil for long since they are already cooked. Once they have reached your desired golden color, remove them from the heat to avoid drying them out or becoming overdone. The sausages can be placed in the pan whole, cut lengthwise, cut in half, or cut into chunks.

Summary:
Add the sausages to a large saucepan filling it with enough cold water to cover them. Use an instant-read thermometer to ensure the core temperature is at least 160 °F (71 °C). Grease the bottom of a separate pan with enough oil to coat it entirely. Place your sausages in the hot oil to sear them.