Easy Pantry Pasta

Name: Easy Pantry Pasta
Ingredients: 2 slice country bread; 6 tbsp. olive oil; ½ large yellow onion; 2 clove garlic; ¾ tsp. crushed red pepper; ¼ tsp. Sea salt; 3 tbsp. chopped parsley; 2 tbsp. chopped capers; 1 large lemon; ¾ lb. spaghetti or linguine; 3 egg yolks; ½ c. grated Parmigiano-Reggiano