Mods in den Spieleordner reingeschoben. So richtig tief.

mods/sandwiches/luas/fish.lua

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+minetest.register_craftitem("sandwiches:cooked_salmon", {
+    description = "Cooked Salmon",
+    on_use = minetest.item_eat(4),
+    groups = {food = 4, food_fish_cooked = 1, food_salmon = 1, flammable = 1},
+    inventory_image = "sandwiches_salmon_cooked.png"
+})
+minetest.register_craft({
+    type = "cooking",
+    output = "sandwiches:cooked_salmon",
+    recipe = "ethereal:fish_salmon",
+    cooktime = 5,
+})
+
+local ingredient = "group:food_tomato"
+if minetest.get_modpath("cheese") then
+  ingredient = "group:food_cream"
+end
+
+if  minetest.global_exists("farming") and  farming.mod == "redo" then
+
+  minetest.register_craftitem("sandwiches:lox_sandwich", {
+  	description = "Lox sandwich",
+  	on_use = minetest.item_eat(12, "sandwiches:bread_crumbs"),
+  	groups = {food = 12, food_sandwich = 1, flammable = 1},
+  	inventory_image = "lox_sandwich.png"
+  })
+  minetest.register_craft({
+  	output = "sandwiches:lox_sandwich",
+  	recipe = {
+  		{"", "sandwiches:bread_slice", ""},
+  		{ingredient, "sandwiches:cooked_salmon","group:food_cucumber"},
+  		{"", "sandwiches:bread_slice", ""},
+  	}
+  })
+
+end -- it needs cucumber
+
+if sandwiches.ingredient_support.meat then
+
+minetest.register_craftitem("sandwiches:cooked_trout", {
+    description = "Cooked Trout",
+    on_use = minetest.item_eat(4),
+    groups = {food = 4, food_fish_cooked = 1, food_trout = 1, flammable = 1},
+    inventory_image = "sandwiches_trout_cooked.png"
+})
+minetest.register_craft({
+    type = "cooking",
+    output = "sandwiches:cooked_trout",
+    recipe = "ethereal:fish_trout",
+    cooktime = 5,
+})
+
+minetest.register_craftitem("sandwiches:trout_sandwich", {
+	description = "Trout sandwich",
+  on_use = minetest.item_eat(13, "sandwiches:bread_crumbs"),
+	groups = {food = 13, food_sandwich = 1, flammable = 1},
+	inventory_image = "trout_sandwich.png"
+})
+minetest.register_craft({
+	output = "sandwiches:trout_sandwich",
+	recipe = {
+		{"", "sandwiches:bread_slice", ""},
+		{"group:food_egg", "sandwiches:cooked_trout","group:food_onion"},
+		{"", "sandwiches:bread_slice", ""},
+	}
+})
+
+end -- if eggs are present