Rigatoni in Vodka Sauce - Instant Pot Singapore

Ingredients

• 1/2 pc medium onion
• 4 cloves garlic (minced)
• 2 tbsp olive oil (plus more for drizzling)
• 1/4 cup concentrated tomato paste
• 1/2 tsp Red Pepper Flakes
• 1/4 cup vodka
• 1/2 cup heavy cream
• 1 cup rigatoni
• 1 cup panroasted or canned tomatoes
• 1 cup boiling water
• 1/4 cup Parmesan cheese (grated)
• Salt (to taste)
• Black Pepper (to taste)
• 6-8 leaves basil (for serving)
• 100 g prosciutto (for serving (optional))