diff --git a/packages/orchestration/src/mock-orch-ertp/mock-ertp/mock-ertp.js b/packages/orchestration/src/mock-orch-ertp/mock-ertp/mock-ertp.js
index 551cc3fdeff..9123470945a 100644
--- a/packages/orchestration/src/mock-orch-ertp/mock-ertp/mock-ertp.js
+++ b/packages/orchestration/src/mock-orch-ertp/mock-ertp/mock-ertp.js
@@ -1,4 +1,5 @@
 import { Fail } from '@endo/errors';
+import { mustMatch } from '@endo/patterns';
 
 import { AmountMath, BrandI, PaymentShape } from '@agoric/ertp';
 import { AnyNatAmountShape } from '../../typeGuards.js';
@@ -250,8 +251,16 @@ export const prepareMockIssuerKit = zone => {
         getAmountOf(payment) {
           return this.state.paymentLedger.get(payment);
         },
-        burn(_payment, _optAmountShape = undefined) {
-          // TODO
+        burn(payment, optAmountShape = undefined) {
+          const { paymentLedger, paymentRecoverySets } = this.state;
+
+          const amount = paymentLedger.get(payment);
+          if (optAmountShape !== undefined) {
+            mustMatch(amount, optAmountShape);
+          }
+          deletePayment(paymentLedger, paymentRecoverySets, payment);
+          // TODO Aha! Must update the encumberedBalance of the source purse,
+          // if any! Must decrement it by amount.
         },
       },
       mint: {
@@ -259,7 +268,7 @@ export const prepareMockIssuerKit = zone => {
           return this.facets.issuer;
         },
         mintPayment(newAmount) {
-          // The mock implementation has no mintRecoveryPurse, or any reccovery
+          // The mock implementation has no mintRecoveryPurse, or any recovery
           // set associated with minted payments.
           const { paymentLedger, paymentRecoverySets } = this.state;
           return makeInitPayment(