Homemade Sausage Patty For Breakfast Sandwich

Homemade Sausage Patty For Breakfast Sandwich.
Ingredients.
For 4 Sandwiches –
2 tbsp of butter.
1 small onion.
1 tsp of salt.
1 tsp of pepper.
1 egg.
2 sausages.
4 bread slices.
lettuce & tomatoes.
2 tbsp of oil ( for fry patties).