Simmer uncovered to reduce liquid
Whisk in a cornstarch slurry
Whisk in a flour slurry
Add a beurre manié
Stir in a roux
Add mashed potatoes
Add tomato paste
Add pureed vegetables
Add cream or cheese
Add egg yolk carefully
Use arrowroot slurry
Use tapioca starch
Add xanthan gum sparingly
Blend in bread crumbs
Blend in ground nuts
Add instant potato flakes
Add gelatin
Add chia seeds
Add a little butter and whisk vigorously
Cook longer over low heat