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A rustic ceramic bowl filled with purple sweet potato and black bean salad, topped with cherry tomatoes, corn, cilantro, and a lime wedge, with a jar of green dressing alongside.
Celine | The Health Detective

Okinawan Purple Sweet Potato & Black Bean Salad

This one earns a permanent spot in your rotation. Purple sweet potatoes are a staple in Okinawa — one of the world's blue zones — and for good reason. They're loaded with antioxidants, fiber, and resistant starch that your gut genuinely loves. Pair them with black beans and you've got a meal that keeps you full and satisfied without the afternoon crash. Make a big batch Sunday and you're set for the week.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 4 people
Course: Salad
Cuisine: Blue Zone Inspired
Ingredients Method Notes

Ingredients
  

  • 2 medium purple sweet potatoes (or orange) cubed Steam, roast, or air fry — all work. See notes below.
  • 1 cup black beans (cooked or canned, drained)
  • 1/4 cup red onion finely chopped
  • 1/4 cup cilantro chopped (optional)
  • 2 medium avocado cubed
  • 1 juice lemon or lime
  • 1 tbsp olive oil extra virgin
  • 1 tsp cumin ground
  • 1/2 tsp sea salt

Method
 

  1. Steam or roast your sweet potatoes until they're tender all the way through — a fork should slide in easily. Let them cool slightly before cubing so they hold their shape instead of turning to mush.
  2. Add the sweet potatoes, black beans, red onion, cilantro, and avocado to a large bowl. Give everything a gentle toss — you want to keep those avocado cubes intact.
  3. In a small bowl, whisk together the lime juice, olive oil, cumin, and salt. Taste it. This is where you make it yours — more lime if you want brightness, more cumin if you want warmth.
  4. Pour the dressing over the salad and fold everything together gently. Serve right away if you love the avocado fresh, or let it sit 10 minutes for the flavours to get friendly with each other.

Notes

Ingredient note:
Steaming keeps them soft and moist — best if you want them to absorb the dressing. Roasting (400°F/200°C for 25-30 min) gives you slightly caramelized edges and more depth of flavour. Air fry at 380°F/195°C for 18-20 minutes for a quicker roasted result. All three work — just let them cool before cubing.
Make ahead/storage:
Keeps well in the fridge for up to 3 days — just add the avocado fresh when you're ready to serve so it doesn't brown.
No cilantro fan?
Swap it for flat leaf parsley or just leave it out. Still delicious.
Boost the protein:
Add a handful of pumpkin seeds or hemp hearts for extra protein and crunch.