Plant-based lamb?

Use a seitan recipe:

SEITAN This versatile vegan meat replacement can be seared, grilled or fried!

• 1¾ cups Vital Wheat Gluten (seitan)
• ⅓ cup Nutritional Yeast
• 2 tsp Garlic Granules
• 1 tsp Onion Powder
• 2 tsp Crushed Fennel
• ½ tsp Turmeric
• 3 Tbsp Soy Sauce
• 1 tsp Molasses
• 1 tsp Tahini
• 1½ Tbsp Oil
• 1½ cups Mushroom or Vegetable Broth

In a medium bowl, whisk wheat gluten, nutritional yeast and dry spices. In a separate bowl, combine remaining ingredients and stir until smooth. Make a well in the dry ingredients and pour in the wet mixture, using a fork to bring dough together (it will be lumpy and springy).

Pour dough onto an 18-inch-long sheet of aluminum foil or parchment paper and wrap like a burrito, forming log.

Bring 4-6 cups water to a rolling boil in a medium pot and place a tight-fitting steamer basket inside. Add seitan, wrapped in foil or parchment, cover with the pot lid and steam for 80 minutes. Do not remove lid. Let seitan cool for 30 minutes before cutting into slices or chunks. Enjoy as is or sear on the stovetop.

Makes 1 large loaf.

Instead of nutritional yeast, add cooked TVP to modify texture. Instead of the spices suggested above, use a lamb marinade or seasoning.

See this video (or this similar one using cooked pasta and tofu).

Happy Easter!

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^{From the OED for "seitan":
Etymology: < Japanese seitan (apparently a1966 (see note); usually written in katakana; not listed in dictionaries of Japanese), probably < sei- raw, unprocessed, bio- (originally ‘life, birth’; < Middle Chinese) + tan- (in tanpaku, tanpakushitsu protein; < Middle Chinese), or perhaps < Japanese sei- to be, become ( < Middle Chinese) + tan-.
The word is said to have been coined in the early 1960s by the Japanese founder of macrobiotics, Nyoichi (or Nyoiti) Sakurazawa, known in the West as George (or Georges) Ohsawa (1893–1966).}