• In a large mixing bowl, mix together grated green papaya and grated squash. Set aside.
  3 cups green papaya, 2 cups calabasa (squash)
• In a different mixing bowl. Mix together cornstarch, all-purpose flour, baking powder, salt and pepper. 
  1 cup cornstarch, 1 cup all purpose flour, 1 tbsp baking powder, 1 tsp salt, 1 tsp ground black pepper
• Add water gradually while whisking until smooth and no traces of flour left. Tip in achuete powder and mix until fully incorporated.
  1 ½ cup water, 3 tsp achuete powder
  
• Heat cooking oil using a deep frying pan over medium high heat.
  4-5 cups cooking oil
• In a small plate or saucer, pour a 2-3 tbsp of batter and then place 1 cup of grated papaya and calabasa.
  
• Place 2 -3 pieces of onion slices then add 1 large shrimp or 5-6 small shrimps on top. Lastly, pour another 2 - 3 tbsp of batter on top.
  1 medium onion, 10 large shrimps (unshelled, with head)
• When oil is hot enough, slide the ukoy gently into the frying pan and try to anchor the batter with a spatula so it won't spread out.
  
• Cook each side for 4 minutes or until golden and crispy. Repeat the process until you finish all the batter and papaya. Serve and enjoy. Bon Appetit!
  

For the vinegar sauce.

• Add vinegar, red onions, garlic, chilis, salt and pepper in a bowl and mix well.
  1/2 cup vinegar, 1 small red onion, 2 cloves garlic, 2 pcs. bird's eye chili, salt and pepper to taste