Salad Kangkung dan Lentil Layu

Bahan-bahan (4 porsi)

• 1 medium sweet potato ( $0.91)
• 1 medium red onion ($1.49)
• 1/4 cup olive oil, divided ($0.64)
• salt & pepper to taste ($0.05)
• 1 cup brown lentils ($0.31)
• 1 bunch curly leaf kale ($1.19)
• 1 clove garlic ($0.08)
• 1 tsp ground cumin ($0.05)
• 1/2 -1 Tbsp apple cider vinegar ($0.06)