Meanwhile, melt butter and olive oil in skillet set over medium heat
Cook leeks, thyme, garlic, salt, pepper, paprika and cayenne for about 5 minutes or until tender.
Stir in shrimp; cook for 1 to 2 minutes or until just starting to turn pink.
Stir in lemon zest and juice.
Divide grits among 4 bowls. Top with shrimp and leeks. Sprinkle with parsley.
Tip: Substitute Emmental or aged Cheddar for Gruyère cheese if desired.