In a medium stock pot over medium high heat, cook the bacon until crisp. Remove bacon but leave the fat in the pot.
Sear scallops on both sides in the bacon fat, remove from pan, and reserve.
Lower heat to medium and sauté celery, carrots, and onion until translucent (about 10 minutes). Stir in tomato paste.
Add butter and flour to make a light roux with the vegetables, and cook for another 5 minutes. Slowly add the fish stock, whisking until incorporated.
Lower heat to medium low and add half-and-half, wine, Tabasco, and seasonings. Taste the bisque and season with salt to taste. Simmer for 10 minutes and add the reserve chopped crispy bacon.
While simmering, chop scallops. Add scallops to simmering bisque and check seasoning.
Serve topped with scallops, fresh parsley, and crispy bacon.
Notes
Note: If you don't have fish stock, you can easily substitute with chicken or beef stock, although the seafood flavor won't be as prevalent. It's still delicious!