Pork Sinigang (Pork Sour Soup) with Lemon

Ingredients

• 1 medium onion, cut into quarters
• 2 2 medium tomatoes, cut into quarters
• 2 qts water
• 2 lbs pork buto-buto ( ribs, neck, shoulder, pork belly or etc.)
• 2 cups green beans, ends trimmed
• 1 large eggplant, cut diagonally
• 1 medium daikon radish (aka. labanos), sliced
• 1 bunch spinach
• 1 large chili or banana pepper, cut in half
• ½ cup lemon juice, no seeds (roughly 4 medium lemons)
• Salt
• fresh ground pepper