Melt 1 tablespoon butter in large skillet over medium heat. Add sausages and cook until beginning to brown, turning occasionally, about 5 minutes.

Add onion and apple to sausages in pan; cook until tender and brown, stirring often, about 5 minutes.

Add apple cider and chopped sage; increase heat to high and stir until liquid is slightly reduced, about 2 minutes.

Stir in lemon juice. Season to tasted with salt and pepper.

Using slotted spoon, transfer onion and apple to 2 plates, dividing equally. Top with sausages. Whisk remaining 2 tablespoons butter into cider mixture.

Season sauce to taste with salt and pepper. Drizzle over sausages and serve.