Oatmeal Leek Soup

Five ingredients and 30 minutes. This oatmeal leek soup is old Scottish farmhouse cooking stripped to its essence: minced leeks simmered in milk, thickened with quick-cooking oats, and seasoned with nothing more than salt and pepper. The oats dissolve into the hot milk, creating a naturally creamy, porridge-like body without any added cream, butter, or flour.

The leeks get a two-minute head start in the simmering milk before the oats go in. That brief cook softens them just enough to release their sweet, mild onion flavor into the liquid. The oats then absorb the leek-flavored milk as they cook, thickening everything into a soup that’s comforting and filling without being heavy.

This soup thickens as it sits, which is why the recipe suggests keeping it warm in a double boiler and thinning with milk or water as needed. Serve it right away for the best consistency, or reheat gently the next day with a splash of milk to loosen it back up.

Kitchen Tips

• Wash the leek thoroughly. Slice it open and rinse between the layers. Leeks trap grit, and sandy soup is no one’s idea of comfort food.
• Mince the leek fine. This is a smooth, porridge-style soup. Large leek pieces won’t soften fully in the short cooking time.
• Serve immediately. The oats continue absorbing liquid even off the heat. Waiting too long turns soup into porridge.
• Whole or skim milk both work. Whole milk gives a richer result, skim keeps it lighter. Either way, the oats provide the body.

Variations

• Add a knob of butter stirred in at the end for a richer, more indulgent version.
• Sharp cheddar: Stir in grated cheddar right before serving for a cheesy leek and oat soup.
• Potato addition: Dice a small potato and simmer with the leeks for a heartier, more substantial soup.