Pasta with Tuna, Tomatoes & Artichokes

Ingredients

• 3 tbsp olive oil
• 1 cup chopped red onion
• 1 tbsp chopped garlic
• 1/4 tsp hot-pepper flakes
• 1 796-mL can Italian plum tomatoes , squished up
• 1/4 tsp granulated sugar
• 1 170-g can solid white tuna , drained, broken up
• 1 398-mL can artichoke hearts , drained, halved
• 1/4 tsp salt
• pinch black pepper
• 1 454-g pkg short-shaped pasta , such as farfalle
• 1/4 cup chopped Italian parsley