Slow-Cooker Split Pea Soup | America's Test Kitchen

Ingredients

• 7 cups water
• 1 pound green split peas (2 cups), picked over and rinsed
• 1 (1-pound) ham steak , rind discarded, quartered
• 1 (12-ounce) smoked ham hock
• 2 bay leaves
• 2 onions , chopped
• 1 celery rib , minced
• 2 tablespoons unsalted butter
• 3 garlic cloves , minced
• Salt and pepper
• 3/4 teaspoon dried thyme
• 1/4 teaspoon red pepper flakes