Given the task definition and input, reply with output. In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Heat oil in skillet.,Add garlic, onions, red pepper flakes and mussels.,Cook on high until mussels open, about 5 minutes.,Cook spaghetti according to package directions.,______,Add white wine to mussels; simmer until heated through.,Serve over the spaghetti.
Discard any mussels tat do not open.