Sukuma Wiki with Matoke (Beef Stew with Mashed Plantains)

Ingredients

• 4 slightly ripe plantains, peeled and sliced 1/2" thick
• Juice of 1 lemon
• 3 tbsp. unsalted butter
• 2 cloves garlic, thinly sliced
• 1 small green bell pepper, stemmed, seeded, and roughly chopped
• 1 small yellow onion, thinly sliced
• 1 tsp. curry powder
• 1⁄4 tsp. coriander seeds
• 1⁄4 tsp. cumin seeds
• 1 cup beef stock
• 1⁄3 cup roughly chopped cilantro
• 1 plum tomato, cored and roughly chopped
• Kosher salt
• freshly ground black pepper
• 2 tbsp. canola oil
• 1 lb. boneless beef chuck, trimmed and cut into 1/4" pieces
• 2 medium yellow onions, minced
• 1 small red bell pepper, stemmed, seeded, and minced
• 1 tsp. hot paprika
• 2 cloves garlic, mashed into a paste
• 1 (2") piece ginger, peeled and mashed into a paste
• 3 canned whole peeled tomatoes, crushed by hand
• 12 cherry tomatoes, quartered
• 1 bunch spinach, tough stems trimmed, leaves thinly sliced
• Small red and green Thai chiles, stemmed and thinly sliced for serving (optional)