Tbsp.

Capitalized, while leaving tsp. in lower case, to emphasize that the larger tablespoon, rather than the smaller teaspoon, is wanted.

Tbsp. (plural Tbsp.)

1. Alternative form of tbsp.
   • 2009, Better Homes and Gardens, Hometown Favorites: More Than 120 Delicious, Down-Home Recipes, Des Moines, Ia.: Meredith Books, →ISBN, page 29:

     2 Tbsp. Dijon-style mustard / 2 tsp. milk / ½ tsp. black pepper / 1 Tbsp. capers, drained

   • 2013, Jorge Cruise, The 100: Count Only Sugar Calories and Lose Up to 18 Pounds in 2 Weeks, New York, N.Y.: William Morrow, →ISBN, page 100:

     Dinner: 1 chicken breast rubbed with 1 Tbsp. Dijon mustard and 1 tsp. black pepper, panfried in 1 Tbsp. olive oil, […]

   • 2018, Leah Webb, The Grain-Free, Sugar-Free, Dairy-Free Family Cookbook: Simple and Delicious Recipes for Cooking with Whole Foods on a Restrictive Diet, White River Junction, Vt.: Chelsea Green Publishing, published 2019, →ISBN, page 273:

     dried oregano, 2½ Tbsp. + 2½ tsp.