Equipment
* optional
Ingredients
Soup Base
- 850 g sweet potato, peeled and cut into 2 cm cubes
- 4 garlic, peeled and finely minced
- 20 g fresh ginger, peeled and finely grated
- 60 g thai red curry paste, paste
- 120 g creamy peanut butter, smooth
- 400 ml full-fat coconut milk
- 950 ml low-sodium vegetable broth
- 30 ml gluten-free tamari
- 20 ml pure maple syrup
- 5 g fine sea salt
Finishing and Garnishes
- 150 g baby spinach, fresh, rinsed and patted dry
- 30 ml lime juice, freshly squeezed
- 40 g roasted salted peanuts, coarsely chopped
- 15 g fresh cilantro leaves, coarsely chopped
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 463 kcal
- Protein
- 12 g
- Carbohydrates
- 44 g
- Fat
- 29 g
- Sodium
- 1035 mg
- Saturated Fat
- 15 g
- Potassium
- 1085 mg
- Calcium
- 105 mg
- Iron
- 4.2 mg
Sources: Aggregated Public Data, USDA FoodData Central
Method
Peel the sweet potatoes with the vegetable peeler, trim the ends, and dice the flesh into uniform 2 cm (0.75-inch) cubes on the cutting board using the chef's knife.
Finely mince the peeled garlic cloves and grate the peeled fresh ginger root on the cutting board using the chef's knife.
Transfer the diced sweet potatoes, minced garlic, grated ginger, red curry paste, creamy peanut butter, full-fat coconut milk, low-sodium vegetable broth, gluten-free tamari, pure maple syrup, and fine sea salt directly into the slow cooker bowl.
Stir the ingredients inside the slow cooker thoroughly with the wooden spoon until the peanut butter and red curry paste are fully broken down and evenly integrated into the broth.
Cover the slow cooker with its lid and cook on the LOW heat setting for 6 hours (or on the HIGH heat setting for 3 hours) until the sweet potatoes are completely fork-tender.
Insert the immersion blender into the slow cooker bowl and pulse the soup for 30 to 45 seconds, blending approximately half of the sweet potato volume until the base turns thick and creamy while leaving pleasant intact chunks.
Add the fresh baby spinach and freshly squeezed lime juice into the hot soup, stirring gently with the wooden spoon for 2 minutes until the spinach wilts completely into the liquid.
Taste the broth and adjust seasoning with a pinch of salt or a splash of lime juice if desired, verifying with the food thermometer that the soup is above 65°C (149°F) for immediate serving.
Use the ladle to divide the warm soup evenly among 6 serving bowls, then garnish each portion with the chopped roasted peanuts and fresh cilantro leaves.
Chef's Notes
- Always opt for canned full-fat coconut milk rather than light coconut milk; the higher lipid content delivers essential body and prevents the broth from tasting thin.
- Commercial Thai red curry brands vary considerably in saltiness and spice level; start with 60g and sample the broth before adding any extra sea salt.
- Adding lime juice and spinach at the end of cooking preserves the bright green chlorophyll in the spinach and prevents lime acidity from degrading or turning bitter under prolonged heat.
- For food safety, divide leftovers into shallow containers so they cool to 4°C (40°F) within 2 hours, and reheat thoroughly until the center reaches 74°C (165°F).
Storage
Refrigerator: 4 days — Cool promptly to room temperature within 2 hours and store in an airtight container at or below 4°C (40°F).
Freezer: 3 months — Store in airtight containers leaving 2 cm headspace for liquid expansion. Thaw overnight in the refrigerator.
Reheating: Reheat leftovers on the stovetop over medium heat or in a microwave, stirring occasionally, until the internal temperature reaches at least 74°C (165°F) measured with a food thermometer.
Troubleshooting
Soup texture is too thick and resembles baby food puree rather than a creamy soup
Cause: Sweet potatoes were blended too thoroughly or lost excess moisture during high-heat cooking
Fix: Stir in 50 ml to 100 ml of warm low-sodium vegetable broth or water until desired velvety consistency is reached
Prevention: Pulse immersion blender briefly and stop as soon as half the chunks are pulverized
Broth tastes cloying, overly sweet, or one-dimensional
Cause: The natural sugars in sweet potatoes dominated without adequate acid or salt balancing
Fix: Add additional fresh lime juice in 5 ml increments and an extra pinch of sea salt to sharpen the flavor profile
Prevention: Always use unsweetened peanut butter and measure maple syrup accurately
Curry broth appears separated or curdled around the edges
Cause: Slow cooker temperature was too hot, causing the coconut milk fat emulsion to break
Fix: Vigorously whisk the soup with the wooden spoon or pulse with the immersion blender for 15 seconds to re-emulsify the fat
Prevention: Cook on the LOW heat setting whenever possible to maintain a gentle, controlled simmer
Cultural Context
While adapted for modern plant-based slow cooking, this soup draws inspiration from central and southern Thai culinary balancing principles known as rod chart, which harmonize sweet, sour, salty, and spicy profiles. The interplay of aromatic red curry paste, rich coconut cream, and savory peanuts reflects the flavor architecture of classic Thai preparations such as Massaman and Phanaeng curries.
