Funny you should mention. Today is soup-making day at our house,. My Bride made Onion soup this AM and I'm making Beef Vegetable this PM.
Density depends on the type of soup you're making. She makes Onion Soup with a lot of broth because she only eats the broth, never an onion crosses her lips! I make the Beef Veggie on the medium thick side. Her Onion soup is the best I've ever had. Here's her recipe: GRAMMY’S FRENCH ONION SOUP
3 Tablespoons butter
2 Tablespoons oil
6 cups thinly sliced yellow onions (2 lbs.)
1 teaspoon salt
½ teaspoon sugar
3 Tablespoons flour
7 (14 oz) cans of beef broth
1 cup red cooking
2 bay leaves
1 teaspoon sage (dried)
Salt & Pepper to taste
Up to 1 Tablespoon instant beef bouillon granules if you want a stronger beefy taste
Choice of cheese – gruyere, provolone, parmesan, etc
Croutons or French bread slices
Melt butter with oil in heavy 6 qt. pan. Add onions & stir.
Cover pan & cook over moderately low heat for 15 –20
minutes, stirring occasionally until onions are tender & translucent. Uncover pan, raise heat to moderately hot, stir in salt & sugar. Cook 30minutes, stirring frequently until onions are rich brown color. Do not let them burn.
Lower heat to moderate, stir in flour. Add a bit more butter if flour doesn’t stir into a paste with the onions. Cook slowly stirring constantly for 2 minutes to brown the flour lightly.
Slowly pour in about a cup of hot broth stirring to make sure it blends well. Addremaining broth & wine, bay leaves, sage and bring to a simmer. Simmer for 30 minutes.
Season to taste with salt, pepper, and instant bouillon.
If not serving immediately, let uncovered & reheat when ready. Cover to refrigerate.
Float bread & top with cheese. Bake @ 350 until cheese bubbles & slightly brown (about 5-10 minutes). Watch carefully so it doesn’t burn.
Another way to serve is to ladle it into oven proof bowls & add cheese. Top with circle of puff pastry dough big enough to fit over the top of bowl. Press the pastry down around the bowl to seal it tight. Cut 1 small slit in the top. Bake @ 450 for 15 minutes – until top is puffed & golden brown. Serve immediately.