diff --git a/electrum/lnonion.py b/electrum/lnonion.py
index 5e00c151c..d996ab521 100644
--- a/electrum/lnonion.py
+++ b/electrum/lnonion.py
@@ -117,6 +117,9 @@ class OnionPacket:
         self.hmac = hmac
         if not ecc.ECPubkey.is_pubkey_bytes(public_key):
             raise InvalidOnionPubkey()
+        # for debugging our own onions:
+        self._debug_hops_data = None  # type: Optional[Sequence[OnionHopsDataSingle]]
+        self._debug_route = None      # type: Optional[LNPaymentRoute]
 
     def to_bytes(self) -> bytes:
         ret = bytes([self.version])
diff --git a/electrum/lnpeer.py b/electrum/lnpeer.py
index 1d965fba4..6e249ad88 100644
--- a/electrum/lnpeer.py
+++ b/electrum/lnpeer.py
@@ -1478,7 +1478,7 @@ class Peer(Logger):
             payment_hash: bytes,
             min_final_cltv_expiry: int,
             payment_secret: bytes,
-            trampoline_onion=None,
+            trampoline_onion: Optional[OnionPacket] = None,
     ):
         # add features learned during "init" for direct neighbour:
         route[0].node_features |= self.features
@@ -1506,6 +1506,12 @@ class Peer(Logger):
                 "hops_data": trampoline_onion.hops_data,
                 "hmac": trampoline_onion.hmac
             }
+            if t_hops_data := trampoline_onion._debug_hops_data:  # None if trampoline-forwarding
+                t_route = trampoline_onion._debug_route
+                assert t_route is not None
+                self.logger.info(f"lnpeer.pay len(t_route)={len(t_route)}")
+                for i in range(len(t_route)):
+                    self.logger.info(f"  {i}: t_node={t_route[i].end_node.hex()} hop_data={t_hops_data[i]!r}")
         # create onion packet
         payment_path_pubkeys = [x.node_id for x in route]
         onion = new_onion_packet(payment_path_pubkeys, session_key, hops_data, associated_data=payment_hash) # must use another sessionkey
@@ -1540,7 +1546,7 @@ class Peer(Logger):
             payment_hash: bytes,
             min_final_cltv_expiry: int,
             payment_secret: bytes,
-            trampoline_onion=None,
+            trampoline_onion: Optional[OnionPacket] = None,
         ) -> UpdateAddHtlc:
 
         assert amount_msat > 0, "amount_msat is not greater zero"
diff --git a/electrum/lnworker.py b/electrum/lnworker.py
index 19272eac2..2e9c9ba29 100644
--- a/electrum/lnworker.py
+++ b/electrum/lnworker.py
@@ -1560,7 +1560,7 @@ class LNWallet(LNWorker):
             paysession: PaySession,
             sent_htlc_info: SentHtlcInfo,
             min_cltv_expiry: int,
-            trampoline_onion: bytes = None,
+            trampoline_onion: Optional[OnionPacket] = None,
     ) -> None:
         """Sends a single HTLC."""
         shi = sent_htlc_info
diff --git a/electrum/trampoline.py b/electrum/trampoline.py
index 9de6a5022..ceb564193 100644
--- a/electrum/trampoline.py
+++ b/electrum/trampoline.py
@@ -9,6 +9,10 @@ from .lnonion import calc_hops_data_for_payment, new_onion_packet
 from .lnrouter import RouteEdge, TrampolineEdge, LNPaymentRoute, is_route_sane_to_use
 from .lnutil import NoPathFound, LNPeerAddr
 from . import constants
+from .logging import get_logger
+
+
+_logger = get_logger(__name__)
 
 # trampoline nodes are supposed to advertise their fee and cltv in node_update message
 TRAMPOLINE_FEES = [
@@ -307,6 +311,8 @@ def create_trampoline_onion(
             }
     trampoline_session_key = os.urandom(32)
     trampoline_onion = new_onion_packet(payment_path_pubkeys, trampoline_session_key, hops_data, associated_data=payment_hash, trampoline=True)
+    trampoline_onion._debug_hops_data = hops_data
+    trampoline_onion._debug_route = route
     return trampoline_onion, amount_msat, cltv