Done. End Stone Smelter.

src/main/java/ru/betterend/client/gui/EndStoneSmelterRecipeBookScreen.java

@@ -1,15 +1,15 @@
 package ru.betterend.client.gui;
 
-import java.lang.reflect.Field;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 
 import com.mojang.blaze3d.systems.RenderSystem;
 
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
 import net.minecraft.client.gui.DrawableHelper;
 import net.minecraft.client.gui.screen.Screen;
-import net.minecraft.client.gui.screen.recipebook.AbstractFurnaceRecipeBookScreen;
 import net.minecraft.client.gui.screen.recipebook.BlastFurnaceRecipeBookScreen;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.item.Item;
@@ -18,37 +18,29 @@ import net.minecraft.recipe.Ingredient;
 import net.minecraft.recipe.Recipe;
 import net.minecraft.screen.slot.Slot;
 import net.minecraft.util.collection.DefaultedList;
+
 import ru.betterend.blocks.entities.EndStoneSmelterBlockEntity;
 
+@Environment(EnvType.CLIENT)
 public class EndStoneSmelterRecipeBookScreen extends BlastFurnaceRecipeBookScreen {
+	private Iterator<Item> fuelIterator;
+	private Set<Item> fuels;
+	private Slot fuelSlot;
+	private Item currentItem;
+	private float frameTime;
+	
 	@Override
 	protected Set<Item> getAllowedFuels() {
 		return EndStoneSmelterBlockEntity.availableFuels().keySet();
 	}
 	
-	@SuppressWarnings("unchecked")
 	@Override
 	public void showGhostRecipe(Recipe<?> recipe, List<Slot> slots) {
+		this.ghostSlots.reset();
 		ItemStack result = recipe.getOutput();
 		this.ghostSlots.setRecipe(recipe);
 		this.ghostSlots.addSlot(Ingredient.ofStacks(result), (slots.get(3)).x, (slots.get(3)).y);
 		DefaultedList<Ingredient> inputs = recipe.getPreviewInputs();
-		try {
-			Field outputSlot = super.getClass().getDeclaredField("outputSlot");
-			outputSlot.setAccessible(true);
-			outputSlot.set(Slot.class, slots.get(3));
-			Field fuels = super.getClass().getDeclaredField("fuels");
-			fuels.setAccessible(true);
-			if (fuels.get(Set.class) == null) {
-				fuels.set(Set.class, this.getAllowedFuels());
-			}
-			
-			Field fuelIterator = super.getClass().getDeclaredField("fuelIterator");
-			fuelIterator.setAccessible(true);
-			fuelIterator.set(Iterator.class, ((Set<Item>) fuels.get(Set.class)).iterator());
-		} catch (Exception ex) {
-			ex.printStackTrace();
-		}
 		Iterator<Ingredient> iterator = inputs.iterator();
 		for(int i = 0; i < 2; i++) {
 			if (!iterator.hasNext()) {
@@ -60,5 +52,44 @@ public class EndStoneSmelterRecipeBookScreen extends BlastFurnaceRecipeBookScree
 				this.ghostSlots.addSlot(ingredient, slot.x, slot.y);
 			}
 		}
+		this.fuelSlot = slots.get(2);
+		if (this.fuels == null) {
+			this.fuels = this.getAllowedFuels();
+		}
+
+		this.fuelIterator = this.fuels.iterator();
+		this.currentItem = null;
+	}
+	
+	@Override
+	public void drawGhostSlots(MatrixStack matrixStack, int x, int y, boolean bl, float f) {
+		this.ghostSlots.draw(matrixStack, client, x, y, bl, f);
+		if (fuelSlot != null) {
+			if (!Screen.hasControlDown()) {
+				this.frameTime += f;
+			}
+
+			int slotX = this.fuelSlot.x + x;
+			int slotY = this.fuelSlot.y + y;
+			DrawableHelper.fill(matrixStack, slotX, slotY, slotX + 16, slotY + 16, 822018048);
+			this.client.getItemRenderer().renderInGuiWithOverrides(client.player, this.getItem().getStackForRender(), slotX, slotY);
+			RenderSystem.depthFunc(516);
+			DrawableHelper.fill(matrixStack, slotX, slotY, slotX + 16, slotY + 16, 822083583);
+			RenderSystem.depthFunc(515);
+		}
+	}
+
+	private Item getItem() {
+		if (this.currentItem == null || this.frameTime > 30.0F) {
+			this.frameTime = 0.0F;
+			if (this.fuelIterator == null || !this.fuelIterator.hasNext()) {
+				if (this.fuels == null) {
+					this.fuels = this.getAllowedFuels();
+				}
+				this.fuelIterator = this.fuels.iterator();
+			}
+			this.currentItem = this.fuelIterator.next();
+		}
+		return this.currentItem;
 	}
 }

src/main/java/ru/betterend/client/gui/EndStoneSmelterScreen.java

@@ -2,6 +2,9 @@ package ru.betterend.client.gui;
 
 import com.mojang.blaze3d.systems.RenderSystem;
 
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+
 import net.minecraft.client.gui.screen.ingame.HandledScreen;
 import net.minecraft.client.gui.screen.recipebook.RecipeBookProvider;
 import net.minecraft.client.gui.screen.recipebook.RecipeBookWidget;
@@ -13,8 +16,10 @@ import net.minecraft.screen.slot.SlotActionType;
 import net.minecraft.text.StringVisitable;
 import net.minecraft.text.Text;
 import net.minecraft.util.Identifier;
+
 import ru.betterend.BetterEnd;
 
+@Environment(EnvType.CLIENT)
 public class EndStoneSmelterScreen extends HandledScreen<EndStoneSmelterScreenHandler> implements RecipeBookProvider {
 
 	private final static Identifier RECIPE_BUTTON_TEXTURE = new Identifier("textures/gui/recipe_button.png");

src/main/java/ru/betterend/client/gui/EndStoneSmelterScreenHandler.java

@@ -58,7 +58,7 @@ public class EndStoneSmelterScreenHandler extends AbstractRecipeScreenHandler<In
 		}
 		for(int i = 0; i < 9; ++i) {
 			this.addSlot(new Slot(playerInventory, i, 8 + i * 18, 142));
-		}  
+		}
 	}
 
 	@Override
@@ -116,6 +116,54 @@ public class EndStoneSmelterScreenHandler extends AbstractRecipeScreenHandler<In
 		return EndStoneSmelterBlockEntity.canUseAsFuel(itemStack);
 	}
 	
+	@Override
+	public ItemStack transferSlot(PlayerEntity player, int index) {
+		ItemStack itemStack = ItemStack.EMPTY;
+		Slot slot = this.slots.get(index);
+		if (slot != null && slot.hasStack()) {
+			ItemStack itemStack2 = slot.getStack();
+			itemStack = itemStack2.copy();
+			if (index == 3) {
+				if (insertItem(itemStack2, 4, 40, true)) {
+					return ItemStack.EMPTY;
+				}
+				slot.onStackChanged(itemStack2, itemStack);
+			} else if (index != 2 && index != 1 && index != 0) {
+				if (isSmeltable(itemStack2)) {
+					if (!insertItem(itemStack2, 0, 2, false)) {
+						return ItemStack.EMPTY;
+					}
+				} else if (isFuel(itemStack2)) {
+					if (!this.insertItem(itemStack2, 2, 3, false)) {
+						return ItemStack.EMPTY;
+					}
+				} else if (index >= 4 && index < 31) {
+					if (!insertItem(itemStack2, 31, 40, false)) {
+						return ItemStack.EMPTY;
+					}
+				} else if (index >= 31 && index < 40 && !insertItem(itemStack2, 4, 31, false)) {
+					return ItemStack.EMPTY;
+				}
+			} else if (!insertItem(itemStack2, 4, 40, false)) {
+				return ItemStack.EMPTY;
+			}
+
+			if (itemStack2.isEmpty()) {
+				slot.setStack(ItemStack.EMPTY);
+			} else {
+				slot.markDirty();
+			}
+
+			if (itemStack2.getCount() == itemStack.getCount()) {
+				return ItemStack.EMPTY;
+			}
+
+			slot.onTakeItem(player, itemStack2);
+		}
+
+		return itemStack;
+	}
+	
 	@Environment(EnvType.CLIENT)
 	public int getSmeltProgress() {
 		int time = this.propertyDelegate.get(2);

src/main/java/ru/betterend/recipe/AlloyingRecipe.java

@@ -28,6 +28,7 @@ public class AlloyingRecipe implements Recipe<Inventory> {
 	protected final Ingredient primaryInput;
 	protected final Ingredient secondaryInput;
 	protected final ItemStack output;
+	protected final String group;
 	protected final float experience;
 	protected final int smeltTime;
 
@@ -35,6 +36,7 @@ public class AlloyingRecipe implements Recipe<Inventory> {
 	public AlloyingRecipe(Identifier id, Ingredient primaryInput, Ingredient secondaryInput,
 			ItemStack output, float experience, int smeltTime) {
 		
+		this.group = String.format("%s:%s", GROUP, id.getPath());
 		this.id = id;
 		this.primaryInput = primaryInput;
 		this.secondaryInput = secondaryInput;
@@ -98,7 +100,7 @@ public class AlloyingRecipe implements Recipe<Inventory> {
 	
 	@Environment(EnvType.CLIENT)
 	public String getGroup() {
-		return GROUP;
+		return this.group;
 	}
 	
 	@Environment(EnvType.CLIENT)