Open-Face Salmon and Avocado Sandwiches

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Unsalted butter, for cooking

Four 1-inch-thick slices rye bread 

1/2 cup sour cream 

2 tablespoons chopped preserved lemon 

Freshly ground black pepper 

2 avocados, sliced 

Flaky salt or coarse kosher salt 

4 ounces smoked salmon 

2 radishes, thinly sliced 

4 cornichons, sliced 

Crushed red pepper, optional 

Handful chopped fresh chives or dill 

Sesame seeds (I like a mix of black and white sesame seeds), for sprinkling 

Lemon wedges, for serving