Caramelized Onion and Garlic Pasta without pineapple

1 large whole head of garlic 1 1/2 tablespoons olive oil 9 cups thinly sliced sweet onions 2 1/2 cups sliced leeks 1 teaspoon salt 1 teaspoon dried thyme 2[...]

1/4 cup butter , cubed 2 large sweet onions , thinly sliced 1/4 teaspoon crushed red pepper flakes 1/8 teaspoon salt 8 garlic cloves , minced 2 cups grape[...]