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Creamy Shells with Tuna and Spinach

www.marthastewart.com
  • minutes
  • Serves

INGREDIENTS

3 tbsp

olive oil

1 small

onion

1/4 cup

flour

4 cups

milk

1 serving

coarse salt and ground pepper

1 large

hamburger bun

1/4 cup

parmesan

1/2 tsp

seasoning

1/2 tsp

red-pepper flakes

10 oz

spinach

12 oz

tuna in water

6 oz

pasta shells